Fighting Fish with Discus?

Question

Please don't say that the temperature is not right cause I've kept Goldfish with fighting fish before. cause I have 200 gallon tank so no problems what do you guys think?

Answer 1

Discus need 80F plus, entirely the opposite of coldwater goldfish.

In theory bettas (aka siamese fighting fish) wouldn't mind the very warm and very soft water that Discus prefer.

BUT, Discus are large fish and need tall tanks, something not suited to a fancy betta fish with long fins to hamper it's swimming capabilities, they prefer shallow warm water. If the 200 gallon was long and shallow, then yes a betta could be kept but it would not be suited for Discus, and visa versa.