Hi, I just picked up my first endlers livebearers last Friday. I have Cobalt Premium flake food with probiotics blend. I crush it real fine for my little guys, but they keep spitting it out, even the fine stuff that is small enough for their mouths. I also have frozen baby brine shrimp, but they can't live on that alone. So I'm looking for ideas on what kind of flake food and other food blends I can give these guys to keep them happy. Thanks.