Yea it's got me stumped mate. I've never come across such a picky fish. Even now I'm looking into his half of the divided tank watching him picking up the Thera a and spitting them straight back out lol and this is after not being fed for 2 days. lucky I put the 2 bristlnoses back they'll clean it up haha. Thing that frustrates me tho is I know if I drop in a heap ON pellets he will demolish them all straight up. The female in the other half of the tank has eaten nearly all her Thera a but it was very slowly. Would try the nls algae max but I've already got about $200 worth of food sitting there that don't get touched. Don't really wanna waste anymore cash