Ok so I have a five gallon tank and stuff.anyways long story short just lost platy oto and gourami all in about 2. Weeks..my ammonia is 0 my alkalinity is high as is water hardness.but I've heard fish can adapt to this...mu nitrites and nitrates are both good.don't have exact lvls with me but they're good...it started out with the gourami not eating then just staying in one spot then dead....I wanna save my other platy and kahuli loach.all fish were fine then it started dropping.iv had my tank about 5 months...here are some pics of the gouramis body((((pls tell me if u can see anything..the anus shot is blurry but his hole wad open ...and it had been for like 3 days...I hadn't seen this before