Be sure to follow-up with medication from your local pet store. Feeding Fish - Fish are either floater feeders, sinking feeders or bottom feeders. Floater feeders have specialized mouths that can open wide to gulp the food floating on the surface of the water. Sinking feeders have specialized mouths that are pointy and can snatch food as it sinks from the top. Bottom feeders have specialized mouths that are shaped to suck or pick food as it settles on the bottom of the tank.
Some fish can feed at two or even three of the levels.
It is important that you know what type your fish is so that you can be sure to buy the appropriate type of food. In general, flake food is for floaters and sinkers because it floats for awhile and then sinks slowly. Tablets are for bottom feeders because it sinks quickly to the bottom, bypassing the two top levels. Pellets are for floater feeders and bottom feeders because some of it floats while some sinks directly to the bottom. Freeze dried food is very convenient because of its shelf-life.