Hi, I have a very sick flame dwarf gourami named Rainbow Fabulous, and I am worried that he has Dwarf Gourami Iridovirus and needs to be euthanized. The thing is, he doesn't have the normal symptoms. He has no sores and no swelling of the spleen that I can identify, but he does lay on the bottom of the tank with rapid gill movement. I have had him in the same tank for twenty months and he has always been happy and healthy until two days ago when he swam upside down a little bit. He then acted normally until today when he is just lying on the bottom of the tank. He's not constipated, he's actively pooping in the picture so I don't think he has swim bladder disease, which seemed to be the other option. I don't want him to suffer, and I think he can drown if he stays at the bottom for too long. Should I euthanize him? My tank is a heavily planted 34 gallon tank, that has been established for twenty months. Ammonia- 0 ppm Nitrtrite- 0 ppm Nitrate- 5-10 ppm pH- 7 temperature- 74F I infuse CO2 for my plants to 35ppm and have for six months with no problem. I use a CO2 indicator and the CO2 and plant light are on an 8 on 16 off light cycle. Other than Rainbow Fabulous I also have 4 zebra danios. Danny Pudi, Danny Glover, Danny DeVito, and Danny Trejo. 1 reticulated hill stream loach. Sticky. 1 octocinclus. Doc Oc 1 zebra nerite snail. Jacqueline This seems like a really light bio load for this size and this age of aquarium to me. No new fish have been added since February or March when I put in the nerite snail.