I'm sorry for your losses
At least you can feel good that you did everything in your power to try to get them better...that alone is an accomplishment
I can't even accurately tell you how many people will just give up...isolate the fish and let it waste away...or just give it away to a LFS at no charge because they simply don't want the hastle of wasting money on meds
I mean it's cheaper to just buy a new fish right? I applaud your effort regardless
Don't give up on them ever...
