Hi I have 2 GBR's in an 80 gal together with large school of Rummies, Glowlights and about 20 Corys ( Juulii and Sterbai). The tetras are quick as lightening and leave nothing for the slower rams. I simply use the clear plastic, rigid tubing you can find at any Petsmart, Petco. As the foods slowly sink in the tube, the Rams have plenty of time to see it, and follow it to the bottom. I lift the tube just off the gravel so they can pick their morsels while the tetras eat flakes or other sinking foods in tank. This method gets the rams a shot at the frozen foods also, as well as delivering a clump of bloodworm right in the middle of the Corys! And after dark, the tube will let you target certain areas of tank without the food landing in the trees.