I have platies and guppies so far. I do keep the tank filled appropriately, but it just seems like the fish struggle on that side of the tank. At the moment, the tank is pretty bare save for some driftwood and a few ludwigia stems. Maybe with more plants, the current will be diffused a bit.
I have been using the one filter cartridge and also the media holder thing.
On a related note, would it be any better if I shortened the intake? Currently, it goes almost all the way down to the gravel.