Hard to say with the cloudy/dirty water, can't tell if it's just fish poop or uneaten food sticking to the fish.
If nothing else - the water needs to be MUCH cleaner. Cubans are VERY sensitive to poor water quality.
i dont think its wc, the seller not sure either, but the fish was imported from Taiwan, maybe they captive breed them there, which i dont think cuban is still rare this days.