So im trying to wrap my head around something. I went to the local fish store yesterday to get a new pump the koralia 1 (which IMO sucks, says 400gph i doubt that), well they had a 35gal cube on display. It had a good assortment of riccia, hc, pellia, ect... I tried to find any sort of flow rate and to my surprise saw none. Not only did i not see any water movement the entire tank was pearling out of control. Only alge was a little slime stuff on the bottom. I asked the guy and he said it stays like this all day every day. So.... why is it that a tank with 0 flow has great results/little to no alge, and our tanks with as much flow as we can get having a hell of a time?