Triggermen i would be concerned, puffing up like that seriously stresses the fish out and can cause damage to it aswell. when the puff up like that, the stress on the fish is so high it can sometimes kill them. for these fish you need to keep excellent water quality. the eyes on puffers have a tendency to become hazey and blurry, kind of like a grey film on the top of it. this is because the water quality is not up to standards, try to keep nitrates under 2ppm and no detectable evel of ammonia or nitrites. if you can do this the fish will live a long time, keep in mind that it stops puffering it's self up like that.