We have a pipefish that won't eat and is just sitting at the bottom. As far as I can see he doesn't have any spots or bloating. We have a 29 gallon aquarium, using a 70 gallon biofilter, we have live sand and 1 live rock, 1 blue damsel, 1 small clownfish, and 1 turbo snail. We have been having some problems with purple string algae too, so any advice there would be great! Could that be the cause of the pipefish's illness? Thanks for any help!