swollen belly

My beloved Green Spotted Puffer has recently developed a swollen lower belly near its anus and been making stringy poop. He was doing fine for a few days and still eating, but recently stopped. He went a few days without eating and didn’t show signs of improvement. I’ve got him in a breeding box...

Was giving my blue hippo a fresh water bath when I noticed his stomach seemed bulging a little bit, does this look normal? Or can this be a parasite . I attached pics Thanks!

I am new to saltwater aquariums and have had this 55gal tank for about 3 months. I have 2 clowns, a sharknose goby, a lemon damsel, a shrimp, and a tuxedo urchin, plus about 15-20 hermit crabs. I regularly test the water and just received a phosphate test. The phosphates are a bit high (adding...

Hi, My new PBT has swollen abdomen and he is not swimming like the first day added to tank. The first day, added to tank, he ate algea in my tank and also I fed him some clam with vitamin C and multivitamin. The next day he didnt eat any thing. also, he didnt eat algea. he completely looses...