i got 10 harlequins for my 20g tank yesterday, so far theyre tankmates are 15 rcs and 3 amanos. they school nicely even in my small 20g

. i put a couple flakes in there today and they would take a bite as it was floating down and then spit it out, i think the only thing that ate the food was shrimp... what should i feed? btw it was tetremin tropical flakes. thanks