how big do they get?
50-100 a month. Don't know where you live and what associated heating costs would be.how much a month do you think it would cost to run a 900 gallon ray pond with 2 bd and all you feed them is massivore delight and run it all on sponge filters, lots of sponge filters.
http://tropicalfishstore.com/ultraquariums.htmlike this the six foot 350 ultra rectangle