I posted on here yesterday but i can't find it. So i am getting rid of my 55 gallon tomorrow. I'm up grading to a 90 right now I have a penguin 350 rated for a 75 gallon. No with the 90 would it be better to just get another penguin or to get a canister filter? I like the penguins cuz they are so easy and the do a very good job at filtering the water. But i want the best for this tank.