The last few weeks I have had 2 peppermint shrimp die (one today), a few hermit crabs, and my yellow belly blue tang decided it would be a good idea to jump out of the tank. After seeing the shrimp today I checked my parameters and ammonia is 0. Nitrites are 0. Ph is about 7.8 or so (this was tested at about 9am) My nitrates were 20 (did a 5g water change after seeing that). My salinity is at about 1.025-1.026 (maybe a little high?). I have a yellow tang and 2 clowns in there now. Along with a few small colonies of zoas, an anemone and a goniapora. My tank is a 24g nano. I'm feeding te fish every other day about a half a cube of frozen food. The days I don't feed them that I feed them a pinch or 2 of pellets. Am I maybe under feeding? Possibly why the shrimp and hermits are dying? ***??