The unknown chemical

Just tried the unknown chemical, and some of the fish in the tank were transformed into another species with another fin.

Put all the fish you don't need (e.g. any doubles) into one tank. Add the chemical and some fish will mutate instantly. Really fast way of getting new species and fins. It makes it alot easier to breed unusual fish and to find the magic fish.

It doesn't show you the way to breed the new fish tho..