29g tank 6 dwarf puffers 7? Ghost shrimp Lots of plants I want to add a small school of bottom feeders to benefit from my messy puffers. They only like their worms floating.....I stir up the sinkers, but there's still wasted food. I have one ghost left for sure, brave ninjas, who comes out after food time, but he doesn't eat much. The others are dead and eaten I think, none of the missed worms are gone the next day and I'm usingvthe turkey baster a lot. Cant find them when I strip clean the tank either. I would like to add a small group of kuhli loaches, 5-6. My big concern is the lava rock cave. I put it in as an abrasive surface for puffers to keep beak healthy (read they needed something even if they don't have issue of overgrown beak other puffers can develop....is this accurate?). They do use the cave a lot so I don't really want to remove it. is this lava rock a danger to my possible kuhlis? what would be another option?