I have 5 of them that is about 10" each. I got them trained on floating pellets. I put the pellets on the return side. The water will naturally push the pellets down and they will eventually find them. You can not have an overflow otherwise the pellet will get skimmed out. Once they learn to take the floating pellets, they will come up to the top of the tank looking for food once they smell it. It took a while to train them. But if floating pellets are the only food, they will find it. In term of salt, I never salt my fishes on a regular basis. I did have to salt them recently due to having to medicate my aro for velvet. I used Nox-Ich in conjunction with salt. I worked really well.