Freshwater Fish Tank

SagaLore

Elite Member
Dec 18, 2001
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I have a 37 gallon tank. I had a cheaper filter that used those cotton filter inserts with charcoal, but it would get clogged fast and was noisy because the water splashed back into the tank.

I bought a much better filter that sits in the cabinet, and siphons water from one tube and feeds it back in another. This thing has a lot more throughput per hour and has multiple layers of filtering - a coarse pore sponge, a finer pore sponge, then some biomaterial for bacterial colony, then a thick bag of charcoal and finally a thin layer of cotton filter.

Many years ago, with a different tank in my apartment, my water was heavily chlorinated city water. The water would stay clear for months, then all of the sudden there would be a bacterial outbreak and the water turned cloudy white. I had to often medicate the water to return it to normal. The PH from the tap was very alkaline - 8.5 - oddly enough my fish gave birth a lot in this water. I had to use acidifying buffer to keep the ph down.

In my last house, the tap water was not heavily chlorinated, but it was very poor quality. We had mold problems in our bathrooms because of it and my tank quickly filled with algae. I had to buy a lot of sucky fish and use algae killer to keep it from being overwhelmed, but even then it was too much. The tap water PH was acidic - around 6 and 6.5. I had to use alkaline buffer to keep it up, but I was using so much that it would calcify all over the hood of the tank. Fish never gave birth in this water.

Now in my current home, I have the new better filter and my tap water seems to be from a spring - it is some A+ quality stuff. No chlorine, but very clean, tastes better than Avon. When I first setup the tank with the new filter, new water, and even new gravel, it stayed crystal clear for along time. The tap PH is around 7, and I use a little alkaline buffer to get it to 7.5 at least.

Okay so now the problem. The fish I have are big belly Mollies, Platys, and now a few guppies. It's been about 5 months with no problem, but now my fish are hurting again. In every scenario, all of my fish end up getting diseases. The Mollies tend to develop Ick and sometimes a big bulging eye. The Platys get red gills and their fins start staying closed, as if stuck. This is just now happening. I haven't added any new fish since I setup the tank. A few months ago I did add A LOT of plants to the tank, it looks like a jungle. The fish have been steadily having babies since I added the plants (about 3 or 4 at a time).

The water doesn't look horrible, it is not crystal clear like it was but there are no signs of algae or bacterial outbreak. I have been keeping the filter clean and each time I clean it I add some liquid of good bacteria to the biomaterial. I also keep a little freshwater salt in the water because Mollies enjoy slightly brackish water.

What am I not doing? :( The tank is in the best shape it's ever been and it still degraded.
 

Kenazo

Lifer
Sep 15, 2000
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my tank is in the middle of an algae bloom, it sucks. The water looks like green Kool-Aid.

Oh-yeah......
 

SagaLore

Elite Member
Dec 18, 2001
24,036
21
81
Originally posted by: Kenazo
my tank is in the middle of an algae bloom, it sucks. The water looks like green Kool-Aid.

Oh-yeah......

The only advice I can give you is make sure direct sunlight is not hitting it, that there is plenty of oxygen in the water (bubblers), and keep in some sucky fish to eat it up.
 

Kenazo

Lifer
Sep 15, 2000
10,429
1
81
Originally posted by: SagaLore
Originally posted by: Kenazo
my tank is in the middle of an algae bloom, it sucks. The water looks like green Kool-Aid.

Oh-yeah......

The only advice I can give you is make sure direct sunlight is not hitting it, that there is plenty of oxygen in the water (bubblers), and keep in some sucky fish to eat it up.

I have goldfishes (2 oranda's, 3 shubunkins and a black moore) and an algae eater of some sorts (can't remember the type, but it looks pretty ugly). I don't have a bubbler in there, but perhaps that might help. The fish seem to have enough oxygen, as they aren't coming up to the top to breathe, like I have seen them do in really oxygen low tanks. But hey, if it'll help I should probably try it.
 

gururu

Platinum Member
Jul 16, 2002
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I'm guessing it's the tap or you are stressing the fish somehow. I'd slowly replace the water with bottled drinking water over a couple weeks. Stick to a strict light/dark regimen. Rearrange the rocks, lighten up the plant load. Vacuum the gravel. I've noticed such problems when moving between municipalities as you suggested. Though it tastes good, I think the water is freaking your fish out.
 

SoylentGreen

Diamond Member
Oct 17, 2002
4,698
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It sounds to me that you aren't doing any partial water changes and just replacing what evaporates.

I didn't see mention of that in your post.
 

SagaLore

Elite Member
Dec 18, 2001
24,036
21
81
Originally posted by: Kenazo
Originally posted by: SagaLore
Originally posted by: Kenazo
my tank is in the middle of an algae bloom, it sucks. The water looks like green Kool-Aid.

Oh-yeah......

The only advice I can give you is make sure direct sunlight is not hitting it, that there is plenty of oxygen in the water (bubblers), and keep in some sucky fish to eat it up.

I have goldfishes (2 oranda's, 3 shubunkins and a black moore) and an algae eater of some sorts (can't remember the type, but it looks pretty ugly). I don't have a bubbler in there, but perhaps that might help. The fish seem to have enough oxygen, as they aren't coming up to the top to breathe, like I have seen them do in really oxygen low tanks. But hey, if it'll help I should probably try it.

Oh okay, that's different. Goldfish has some pretty powerful exrement, their waste lowers the PH fast and encourages algae growth - but goldfish seem to like that environment. What I've read is that low-oxygen water also encourages algae growth. Probably a small ball bubbler would help, even throttled back with a valve.
 

SagaLore

Elite Member
Dec 18, 2001
24,036
21
81
Originally posted by: SoylentGreen
It sounds to me that you aren't doing any partial water changes and just replacing what evaporates.

I didn't see mention of that in your post.

No I never do partial water changes. Am I accumulating too much mineral content? Without the old splashing filter, the water doesn't evaporate so fast and I've only had to add some water once.
 

DurocShark

Lifer
Apr 18, 2001
15,708
5
56
Originally posted by: SagaLore
Originally posted by: SoylentGreen
It sounds to me that you aren't doing any partial water changes and just replacing what evaporates.

I didn't see mention of that in your post.

No I never do partial water changes. Am I accumulating too much mineral content? Without the old splashing filter, the water doesn't evaporate so fast and I've only had to add some water once.

Minerals AND nitrates. Triggering bacterial and algae blooms.

10-20% water change every week is ideal.
 

gururu

Platinum Member
Jul 16, 2002
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Originally posted by: DurocShark

Minerals AND nitrates. Triggering bacterial and algae blooms.

10-20% water change every week is ideal.

Yup, nothing but the water evaporates from the tank...
 

bleeb

Lifer
Feb 3, 2000
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Partial water changes are best... reduce the time you turn on your lights... try to get out of the sun. The best filter I've seen for cheap is the Millennium filter... also try using better charcoal and zeo (white stuff) when you feed, make sure you only feed enough so that all of it gets eatin. I don't have any plants in my tank, and I basically leave the light off most of the time. Reduce the number of fish you have in your tank.. I only have two (a red empress and Moorii) in a 40 gallon.
 

SagaLore

Elite Member
Dec 18, 2001
24,036
21
81
Originally posted by: gururu
Originally posted by: DurocShark

Minerals AND nitrates. Triggering bacterial and algae blooms.

10-20% water change every week is ideal.

Yup, nothing but the water evaporates from the tank...

Shouldn't the plants and the biomaterial take care of keeping the nitrate level down?

Is nitrate responsible for the problems I have with Ick? My poor mollies get covered in it.
 

DurocShark

Lifer
Apr 18, 2001
15,708
5
56
Originally posted by: SagaLore
Originally posted by: gururu
Originally posted by: DurocShark

Minerals AND nitrates. Triggering bacterial and algae blooms.

10-20% water change every week is ideal.

Yup, nothing but the water evaporates from the tank...

Shouldn't the plants and the biomaterial take care of keeping the nitrate level down?

Only if it's a HEAVILY planted tank. Even then, the plants will extract trace elements from the water that need to be replenished. So you need to do the changes regardless.
 

SoylentGreen

Diamond Member
Oct 17, 2002
4,698
1
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Originally posted by: SagaLore
Originally posted by: gururu
Originally posted by: DurocShark

Minerals AND nitrates. Triggering bacterial and algae blooms.

10-20% water change every week is ideal.

Yup, nothing but the water evaporates from the tank...

Shouldn't the plants and the biomaterial take care of keeping the nitrate level down?

We have found the root of your problem.

You need to do 20% a week on a small 37 gallon tank. Now that your tank is suffering I'd do 40-50%.

What I used to do is keep my old plastic milk containers, fill up 4 of them (20 gallon tank), you need to do 6-7 treat them the night before or even 2. The best part of this is that even in winter the house would be about 70-74 degrees and the water would be about the same, closely resembling the tank temperature. Remove the old water and pour in the new. I'd always do it via the filter, turn on the filter and pour the water in slowly. I always had a side filter not canister so I'd just pour it in where the stream comes in.
 

Ryuson99

Golden Member
Feb 9, 2004
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I felt like bringing this back from the dead.....anyways



you might need to get an RO/DI unit to make sure you putting clean water in the tank as your tap water may be contaminated and feeding the algea