Today I noticed all 3 of my pearl gourami vomitting their food 1 hour after I fed them. I don't think I overfed them because they finished all their food in less than 3 minutes. I feed them tetramin and they are in a 20 gallon tank with 4 corydoras, 5 zebra, 5 cherry barb, and 2 tiny angels. Tank is cycled and there's a ton of filtration in the tank. At least 500gph.