I just installed a filter on my setup. When I turn it on, it does its job but then I notice that it also creates a "stream" or bubbling brook effect that creates a current that my little turtle has to swim through to get to other areas of his home.
I dont know the effects of this but it seems that he was used to the still water more. Plus the bubbles distract him somewhat at most times. I dont know, he chases after some of them actually.

