something wrong with my clown

Hello, last night I came home and my small clown was bloated and I'm not sure what the cause is? This morning he was normal again and all bloating gone but when I fed the fish sure enough while feeding his bloating returned. All other fish are fine, water perameters are great.

ammonia 0
nitrite 0
nitrate 0
ph 8.2
phos 0
alk 9dkh
ca 360ppm

sg 1.023
temp 79 - 80

 

What are you feeding the fish?

 

May have eaten too much... Your parameters are fine!!!

 

I feed marine flake (just a little bit) and throughout the week I feed a frozen food made by hikari which is a mix of krill, squid, mysis, etc. It's a mix of seafood and I don't overfeed this either. The fish are fed in the morning and at night. I also add the seaweed sheets for the tang and zooplankton and phytoplex(liquid forms). I think he might just be getting fat or overeating because he's still swimming around and eating. The bloating goes down and I understand that with dropsy it doesn't go away. I had a cichlid which I believe had dropsy and well he died before I could treat it. Is dropsy contagious or just within the fish?