I have 3 tanks now that have shrimps in it. Main one is a 12G shrimp tank heavily planted with 2 cories and no other fish just RCS, ghost and a bamboo
I'm setting up a 28g cube with a single angler. I've heard that snails and hermits are ok in there. What about a reef lobster like these guys?
I'd say the answer to the question is relative to the type of soil you have. Some brands like ADA Aquasoil have a finite life. The ammonia enrichment
Kyle is a smart shopper. "I want it NOW!" will get you into all kinds of trouble unless you are independently wealthy. (I'm definitely not.)
RCS are somewhat territorial believe it or not. It may be a stress thing causing the bland coloration. How many RCS are in the tank together, and what