I would like to have 1 to 3 fish (smaller fish and non-schooling) in my shrimp tank just to allow for more fertilizer for the plants. I had thought of getting a siamese fighting fish again but I read that the shrimp can be bothersome for the fish so I am not sure I want to risk that. Any suggestions?
Betta fish have such a wide personality that it can be hard to say that they may be completely fine with your shrimp (some will keep pecking at them as if they are food, etc.). Some good fish are normally those of similar size (tetras are a good example), or those commonly referred to as dither fish (almost all species of danios for example).
Smaller fish that can’t be food for the shrimp, but also fish that aren’t aggressive such as cichlids or those that would view shrimp and smaller creatures as food in the tank.
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There are quite a few fish that can be placed in the same tanks as shrimps but with some you would have to be very cautious as to how many you place in as some can hunt shrimp in groups so that is definitely something to look out for.
A few that I can recall that you are able to keep in a tank with shrimps is
Guppies: If you choose to keep these in the same tank as shrimp, ensure there are less guppies in the tank than there are shrimp as guppies tend to hunt in groups rather than on their own.
Tetras: These are ideal to keep in a tank with adult shrimps as they are small and wouldn't even try to eat anything bigger than they are. Baby shrimps are a different story though with tetras as they would be roughly the same size and they would attempt to eat them.
Loaches would also be an ideal choice to have in your shrimp tank. They do not eat shrimp and should not be a problem.