Puntius denisonii aka red line torpedo barbs will do fine in the upper 60s into the high 70s. They are an active fish best kept in groups- they hang together a lot- almost to the point of schooling.
sharks become aggressive anyways and will prolly kill the goldfish in the long run. I wouldnt risk it.
Goldfish, especially fancy varieties, actually prefer slightly warmer water. I still think that mixing them with a shark is a bad idea, but goldfish do not require cold water.
hmmm.... by white tipped shark, if that is in fact a columbian shark, you are aware that it will need to be weaned into a brackish environment, right?
Fancy goldies shouldn't have a higher temp than 74 degrees and for comets, they should have a temp in the 60's. One of the reasons for the lower temps for goldies is the higher amount of O2 in the cooler aquarium. The warmer the water, the less O2.
Balas are not the only tropical fish called sharks.![]()
White tipped sharks are usually referred to as columbian sharks, these catfish need brackish when young and full marine while adult. Of course you will hear people saying they've kept them in FW but plain and simple they need brackish water.
They also get pretty big, 16-20", I've seen some at 12" but I've never personally seen them bigger then this.
How big is yours now? How big is your aquarium? Judging by the tankmates you'll probably start seeing some missing fish in the future
Good luck with them, I love mine!