there is none that is cham friendly, it just needs time to cure, when i made my cages i let the eurothane cure for 6-8 weeks but if your just staining it wont take that long, maybe 1-2 weeks
sounds like time for a vet visit. the tail looks like it got broke somehow, did he get caught in his door/? and the snoring sounds like he picked up a respiratory infection. good luck and i wish your cham the best
the tree on the left is commonly referred to as the money tree and it is safe for chams, as far as the mold that particular brand uses chicken feces for the organic matter, ive gotten fungas knats, mold and mites from that soil and no longer use it.