Are those new slime rocks or did the old 1s get more interesting? If you're worried about disease from the new fish you could either bleach them &/or allow them to air dry. Personally I'm a bleacher & dechlorinator most of the time but it doesn't kill everything as I thought it should

I feed my hillys & stiphodon gobies of all kinds Repashy Soilent Green most of the time. I hope it works as well for you when you get it as it has for me. I don't think I'd have tried to keep hillys without it. You can paste onto rocks (not too smooth, it doesn't stick well) or just drop pieces into the tank. I mix up a batch & freeze it in small containers big enough for a week's supply.