I have a spare 29 gallon now, what kind of monster fish can i put in there for a few months? heres my plan, i have fish in a 55 now, (nd the empty 29) ni about 5-6 months i plan on buying a 110-125 gallon for them, and using the 55 for whatever is in the 29 at the time. the water is cycled, clean, and ready for fish, just dont know what monster fish stay small... really dont know about anything but Bichir. i just want another kind of monster fish other than Bichir now.