Tank is a Fluval Profile 1500 (500ltr) and fish are - Palembang puffer, 3 Silver dollar, 2 pleco, 2 Severum, 2 Jack Dempsey, 2 Rope fish, 3 Upsidedown catfish, Silver shark and a long snout Distichodous. The tank is well established and all fish cohabit very well.
I returned from work on Thursday evening to find that the cover from the filter inlet (Fluval 305) had been knocked off and the puffers belly was sucked into it. I turned the filter pump off and carefully removed the inlet pipe and (after puffing up) Peter swam free.
Obviously he was very stressed and still seems so, also he hasn't eaten since and just ignores any food I try to feed him. My main concern at the moment is the damage done to his underside.
Photo after I freed him from the inlet...

Photo taken this morning...

.
I guess my question is, is there any treatment I need to give the poor guy and will the damage heal over time?
Thanks
Jon

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