I have seen some videos on the fluval fx5, people say that the output creates a current in the tank. Would that be a problem for my tank? Or is a little current good?
I saw one guy angle his output up so that the current wasn't too strong. Maybe that works, but I'll have to see if I get a fx5.
Some current is good, you want all the water in the tank to circulate through the filter. The only time to worry about it is if you have tiny little fish that could get stuck to the intake. You can manage your current with a canister filter with the placement of the intake and exhaust hoses.
I catch crappie and sunfish in the river all the time, they are certainly not adverse to current. Yellow perch is more of a pond and lake fish and likes peaceful water, but they work fine in a well filtered tank also.
I have a magnum canister in my 55 gallon tank, and a aquaclear waterfall in my 45 gallon. If money was no object I would have canisters for both.