about two months ago i restarted my 10 gallon aqurium, now i have 3 cory cats and two fantails (one medium and one small; recently puchased) in it and i want to put them all in a bigger tank so they can have more room. the biggets tank i can fit in my room would probrably be a 30-40 gallon (Tall) tank. would this be big enough for them? i have also been thinking about adding some sort of fillter feeder(clams) to the bigger set up......any info you have is welcome