Fancy Goldfish!Maybe some fancy goldfish. They are not slender by any means, they grow large, are not very expensive unless you buy show fish, and are not nippy or carnivorous. I know I will get flak for this, but goldfish do not need cold water. Many of the fancies cannot even handle cold water. Fishbase has carassius auratus, the goldfish's wild ancestor, listed as living in water up to 41*C, or 105.8*F. People who breed them do so at around 78*F. They are fine with the gulper's water, and if you have a gulper, you need massive filtration and a good bit of water movement anyway.
I wrote the rant on another thread.
