Originally posted by: TrevorRC
Originally posted by: HardWarrior
Most tubing is permeable, even though you can't see the holes. That's why when you use tubing long enough the particles that make most additives colored work their way into the wall of the tubing. Water molecules function the same way, only they're even smaller. I suspect Tygon and Primoflex will last for a good while. Years maybe, if you treat it right, but frankly I've never used any tubing for longer than a year.
Same here. Everything except solid tubing [and then even some of that] is porous; but didn't think the difference would be substantial.
I change my build enough that I just buy new tubing whenever I change it.
******Also, @ OP... you don't need two pumps. One single D5/Eheim 1250/MCP655/MCP350+inlet mod will do the job.
You aren't running crossfire, and even then you probably wouldn't need it [provided you weren't using full coverage blocks and a storm.]*******
If you have anything other than one of the above models, let us know what it is. [The model you listed is on par with the 1250, AFAIK.]
Adding an extra pump will just contribute to the heat dump in the water, and if you don't ahve any issues with a single one, a double really won't make too much of a difference.
--Trevor
what exactly do you mean in the field in stars, i know the crossfire but the other