You r the one who decides what your fish eats...I've got SW fish only, reef, and rare FW tanks. Best all around food they all eat is mysis shrimp...if they don't respond to that, u may hav other problems. Sorry, didn't read what u feeding, but if was live caught, may hav to transition to frozen, like spirulina brine, or like I mentioned, frozen mysis (if u haven't tried, buy!!!, good s++T)
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So how are the Dats doing now on your diet? I have 5 which were about the same size 6 months ago. I actually used a small ceramic dish half filled with bloodworms (live) to feed them (first month). The largest one is about 4.5 inches now and the smallest about 3.5. Good luck! Beautiful fish you have.
I had to put in a tank by itself so it wouldn't be completing and got it to eat cut up red wriggleers. May try the mysis next.
Sorry for the thread jack OP. Your little guy looks awesome btw.