I have good water quality, had a small amount of ammonia but have since done 2 or 3 water changes. low flow, 150w mh lighting....Ive had it for like a month and a half and it was doing great(6+ inches when open). Last week it moved to the bottom of the tank in a small cave and started opening less and less. now the tentacles are starting to look small and dark as well as its body and some tentacles even look like they are non existent now. It is def still alive so I need to do what I can. Let me know if anyone has any advice