hello i have been a new fan to the hobbie and more then happily keeping more then 60 fish in multiple tanks! my favorites are the asian redtail, my tsnxrtc, and my rtc. they are all around 6-8 inches now in a 180 and share it with a few oscars. i have been reading these questions for well over an hour now and answered some questions and provided me the information to procede from here. i was recently trying to find out what the cheapest setup for all the cats would be. glass or acrylic is absolutely not going to happen at the size enclosure i want them to have, but thankfully for all you guys here and on the site i'm thinking of a metal framed pool will be ideal and i may line the outside with field stone. this project is probably going to have to wait until winter at this point due to outside stuff but i cant wait, great comments, great questions, and really great advice. i will defiantly be following this post along