Goldfish. I search for ones with almost show standard and these ones tend to be very expensive sadly. Doesn't matter as long as I get to enjoy them. Their food bill and construction of new pond are "burning more holes on my wallet" along with some new tubs since I am looking to accommodate a few more.
My Peru Oscar. Just finished the stand for the 125 that's probably going up this or next weekend. Cheap stand, but the tank was around $300 new. That's a fine price, but the wallet is thin.
ASIAN ARO...., dont you think thats the most costly fish to have and maintain?
perhaps do make another thread which says which fish cost less to maintain, then my answer will be Oscar , mine eats anything...and I mean ANYTHING, and less water chance since I only have one O..