We have 2 cheats and tips on iPhone. If you have any cheats or tips for Tap Fish please send them in here. We also have cheats for this game on : Android
You can also ask your question on our Tap Fish Questions & Answers page.
To keep your fish alive without having to revive them you have to put them all into the inventory and then let them out when you return.
You will get 1 coin every time you tap a tank when you return after a period of time and also when you feed new fish individually after you buy them.