"Michael" wrote in message ...
I bought a Filstar XP2 (300gpm canister), and two new 300gpm powerheads for
the undergravel.

I know you already have fish in there, but you may want to think about
removing the undergravel filters. I kept tanks with UGFs for about 13
years, so I speak with experience when I say they're not worth it.

Over time, they accumulate enough mulm to really drop your pH. They
require very thorough vacuuming, limiting your ability to add plants
and such. And, getting back to your original question, you'll have an
awfully high flowrate for the types of fish you're getting. (Many
loaches, by comparison, would love that much current.)

A 300 gpm canister should be adequate filtration. If you can arrange
it so that the intake and outlet are on opposite ends of the tank, you
should get plenty of circulation as well.

- Jim