ok..... i have a penguin 330 on my 55g tank. i want to get another one for it. i want iut to be another penguin. i have $30 to spend. i could get another 330. but the only problem is i may be moving and the 55g tank might not fit. i will maybe have to move down to a smaller tank. but i want top but a filter that will also do good in a tank smaller than 55g. the 330 i think would be over kill for a 10g tank. the tank i may have to go dwon to varies from 10g-40g. so i dont know which to go with. i will go with what the manufatuor site says for the amount of G it does. the penguin bio-wheel mini does 20g, the 125 does 30G, the 170 does 50G and the 330 does 70G. i dont know with which one to go with. all advice would be helpfull. thanks a lot
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