small pellets, floating is the best. oscars are pigs. they will eat even when full. i started with live brine when 1in, and went to pellets. you can control the over feeding with the pellets. put 3 in and wait till all gone. pellets expand when they get wet. i had mine for 10yrs it got 10in. 1in per yr,in a 55gal. he would eat 8-10 lg goldfish in 1 feeding. but as for live goldfish beware of infected feeder goldfish. one cannot tell till it is to late. my died from a bad batch of goldfish, and the lfs
told me that is the chance you take when you feed live foods. when he gets bigger go with med pellets, then lg ones.
75gal oceanic with 20 gal refugium, 750g.p.h.pump for HSA-250 skimmer, EHEIM-1250 PUMP FOR 200gph mincal. calcium reactor with 20lb co2 tank and co2 regulator with solenoid, 800G.P.H. overflow box pump and filter, aquaclearl 500 power filter for circulation and carbon use only,wave maker 900, 3x300g.p.h., pinpoint ph controller, delta star 1/3hp chiller.with 600g.p.h. pump, spectrapure automatic liquid level controller for the addition of ro.di.top off water, kent marine 4 stage delux maxxima 35g.p.d. hi-s, t.d.s. monitor, flush kit, 170lbs live rock, 5in sand bed, acropora's LG green,pink, and med purple, LG montipora encrusting purple, LG porities coral yellow, LG ruffled ridge coral, LG starburst coral green, green hairy mushrooms 100+, blue mushrooms, red mush, fluorescent green mush,green striped mush, bubble coral, LG finger leather and 2in baby, green ricordia mush, in refugium halimeda plant, caulerpa, and lot's of bug's. 1 purple tang, male and female percular clown's, 1 yellow wrasse