This completely depends on what is wrong with your fish. There are some foods that can help with things like digestion or constipation, but those are usually used along with either external medicines, or with specific doses of aquarium salt.
When they are sick all you do is click on them then click heal. To heal them the cost is 5 coins. It's worth it.
they are sumtimes named the colour that they are, for example 'the red food fish', or the 'green food fish'. Does this help ??
A cleaner wrasse is a fish that cleans fish to get there food and help the fish get heathy again.
Water food time
they can be used as food
fish oil
If you mean "Can a fish heal a cut?", the answer is yes.
I dont think this one has an antidote but I surely this it is seaweed?
it helps them locate a direct food source (the fish).
It gives us fish food
If your fish food is staying afloat for a week it is most likely because it is just buoyant and you have overfed your fish. Feeding your fish less will reduce fish food staying afloat as well as help keep your fish and tank healthy.
heal