what is the tank temperature? I think their upper range stops at about 76F, so they should be alright in a tropical set up as this is about mid-range for most tropicals (at least the ones i'm aware of), but really the coldwater tank is probably the most advisable. At the higher temperatures the fish's metabolism is increased and they become even bigger waste producers than normal
![X :X :X](/images/smilies/ipb/nugget.gif)
. Also, the coldwater will suit him better as fish seem to do best (IMO) if they are kept about midway through their temp. range. Also if the tank gets ich you will want to raise the temperature and then he will likely be out of his range and WILL be under stress.
And just think how many more pretty tropicals you could add to that tank if you took out the 14+ inches of indiscriminately eating goldfish