Try cutting tiny pieces of tilapia fillet or any fish fillet & see if he grabs it. You could also try hikari carnivore pellets & see if he grabs those as there falling in the water column. The oscar should clean up the mess if he doesn't. Bloodworms are gd to get some quick calories down, but a bulkier food should be offered pretty soon. Bloodworms alone will sustain him ok, but not advance him like other foods will...also, be careful the oscar doesn't start to negatively affect the dats feedings in time as he grows much quicker than the dat