My 20 gallon tank has 6 zebra danios 2 platies and 3 ghost shrimp. The zebra danios are always getting the food before the platies can even get to it and I'm worried about them. I only got the platies yesterday and they are perfectly healthy and try to get to the food but the danios are faster. I am thinking I should get sinking foods for them because when they got even one flake they spit it out and didn't like it so I am thinking to get them sinking pellets. Is this a good idea? Or will the platies eventually get faster at getting food?