I currently am feeding raw frozen shrimp chunked and thawed. i am looking for other ideas. i do know they scavenge and all but like to make sure they are not hungry. i have a tall cylinder aquarium with a full canopy and top. i am looking for something maybe i wont have to pull out later if uneaten. are there any larger sinking pellets that i could use tongs to spot feed them? i have four. a banded, harlequin, key lime, and colored giraffe. thanks for any help