Hi all, Long story but I have a 120 gallon new tank, setup and run for over 3 weeks, cycled fine, dual eheim canister filters, redundant heaters set now to 79. I originally stocked with 3 ropefish, 3 roselines, 3 tinfoils and about 14 tiger barbs. That was a couple months ago. I originally lost all but 3 of the tiger barbs. afterwards I lost 2 of the ropes. Now my last rope is sick, showing the same signs as the previous ones, and I can't figure out what's going on. I've been testing water almost daily now, both with sticks and the full chem set. Nitrate & trites at 0. Ammonia 0. PH is the only thing that's a little high at 7.5 but everyone I've asked at the lfs says that shouldn't be the issue. Been doing water changes weekly, about 20%. I've recalibrated my heaters and right now I'm trying a broad spectrum antibiotic (last resort recommendation from lfs, I hate using chems). I'm trying to post a pic but basically he's listless at the bottom of the tank, tail on the ground and floating straight up with head bent over so it looks like he's a candy cane. The lfs was thinking swim bladder disease so that's why the broad spectrum antibiotic. I've got quite a few tanks in my house and never had anything like this happen. I just don't understand what's going on. Any suggestions/thoughts would be greatly appreciated!