Is My Fish Fat, Sick Or Pregnant?!

[draconis]

Yesterday I noticed my shark has this HUGE belly. He did not have this 2 days ago. Anybody have an idea of what could be happening? He looks otherwise OK. He is swimming and eating as usual. Here are the water stats this morning. I change 40% water every Sunday.
PH 7.8
Ammonia <0.25
Nitrite 0
Nitrate 40

Videovideo

 

[draconis]

video

UPDATE: The LFS says the fish looks OK. HE says is constipation due to over feeding. says to boil some pees and feed them to the fish. I will try that tonight. Anybody think it could be parasites?

 

[jock2007-]

not got a clue whats going on, but nice fish !!!!

 

[draconis]

not got a clue whats going on, but nice fish !!!!

Thanks. At this point there's not much hope. The small shark we found dead dead this morning - of no apparent reason, no scratches, blood, no symptoms until this morning. The red tail cat now has a swollen belly and the big shark is about to explode. Another lfs told me to mix mashed garlic with the food. I'll try that tomorrow, as I tried a medicated food this morning, but it doesnt look like they ate it.

MAn...more than a year without issues and now this... so sad...