I know that they'll spawn in a 1/10 ac pond, and probably would spawn in a bathtub if given the right conditions.

I'll bet they'd spawn in a 50 gallon aquarium!


www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).