What type of fish eat copepods?

[Dork Fish]

Are there any communal fish for a 75 gallon tank that will eat copepods?

[Guppysnail]

Depends on the type of fish already in the tank. 
Rasboras, guppies, psuedomugil, ellasoma and basically any nano fish. They are micro predators and the copepods are a natural food source. Larger fish mostly ignore them as not worth the effort to hunt. 

[Dork Fish]

@Guppysnail I actually don't have my 75 gallon set up yet, but I have a 10 gallon that has some copepods. I plan to move my fish from the 10 gallon into the 75 gallon (just 1 male betta).

I will be attempting to not bring the copepods over with the betta, but just in case. lol

[Guppysnail]

Copepods are healthy for a tank. I have nano fish and corydora that love them. It ensures a live in tank food for fry and small fish. They eat leftover food so also help keep the tank clean. I believe they come on food. They show up eventually in every single snail and shrimp tank I have ever had that has no micro predators. 
I really would not worry. I use a macro lens and watch them. They are very interesting to watch and entirely harmless to any inhabitants in your tanks. 

[Dork Fish]

@Guppysnail Okay that is actually really good to know 🙂

I do plan on having some corydoras, so that will work out well. I got a couple pics of them under a microscope, I will try to post here if I can find them.