The threads have been merged to combine all of the recommendations on this issue. @Rahulreece - we wish you all the best with your fish and your aquarium reef!I saw your other post - it is best to keep with one post, it gets too confusing otherwise. Here is what I wrote on the other post:
When a fish struggles to swim up off of the tank bottom, but still eats well, I always suspect an under inflated swim bladder. That makes the fish sink. There is not a good cure for that however.
Jay