What would be comparable to an Emperor 400? I found one on Drs Foster and Smith for $37.99 and by the time I had the money to buy it (along with some other stuff to even out the shopping) they don't have it now. I have one already but I wanted a second one for my 125g. Would it be ok to put a 400 on one side and a 280 on the other side or is there a power filter that would be just as good if not better to go with the one I have.