too much current>? how to know?

[squid]

how do you know if your cories have too much current in their tank?

i just added a 4 ft rainbar and also a rio 1700 powerhead..

they keep swimming around... is this a good thing?

i have lots of driftwood and plants in the tank though..

but a little worried that they'll have too much current?

in the wild do they swim in strong currents?

or should i turn off the powerhead during night time?



i also have another powerhead.. but its smaller in size also in the tank.. it feeds the overhead filter bix.

[Shane]

I really can not see any reason to have a strong current in a Corydoras tank. The only sp. I have ever collected in creeks with a fair amount of current was C. venezuelanus. That said, I have also collected this sp. in very slow moving water. While there may be a handful of other piedmont cory spp., like C. venezuelanus, the vast majority are found in quiet waters. In fact I have collected many spp., like C. septentrialis, C. venezuelanus "black," and C. habrosus in water was actually stagnant.
-Shane

[squid]

thanks!
i'll remove the rainbar and just add another filter box then:)
thought they came from fast running water