Well in short... its died. It was only a baby and I want to know why. Firstly apologies if this is wrong forum but I didnt really know where to put it and I am a newbie really when it comes to fish.
So the story... my tank has been set up for roughly 3 months now. Its a small-ish tank of around 18litres and had at its peak 5 black neons, 5 blue tetra neons, 2 corydoras catfish, 1 gibbicepp and a fighter fish. All was going fine in the tank, water quality fine (I have a test kit) and I regularly do part water changes the tank has all the right bits, heaters, oxygen bubble things, filters, hiding places, plants etc. All in all, I thought I was doing well.
I added the fish gradually with the cat fish going in first, then black neons a few weeks later, then finally the batch of tetra neons and fighter fish. Well... this is when problems arose, mr fighter fish (despite the auqarium lady insisting they were "friendly" fish) started chasing and bullying my poor little blue neons and within a week the dreaded WHITE SPOT DISEASE. So I ran (literally) to my local shop to pick up a treatment... he plague still managed to kill 3 neon tetras and the fighter fish (justice perhaps?). Anyway, the tank settled and I let the fish adjust back to life until 2 weeks ago when I added a male fighter back in (to be fair this one has been well behaved) just because I think they look damn cool, but soon after I started to notice my gibbicepps cat fish looking a bit tired, wasn't eating and well... generally wasnt doing much. I was use to him being the big daddy of the tank always sitting under his bridge and keeping the glass clean and today to my horror I find him DEAD. I cant see any reason, water quality is fine and the test kit shows things are good. Onlt thing I can say is that the gibbicepp had a pale mark on his head. Is it possible white spot could of lived in him for this long before killing him? I've added another treatment of white spot just in case... but I wait your opinions my friends.
Thanks for taking time to read
(oh by the way, if you're wondering why I had a gibbicepp anyway I was planning on taking him back to the aquarium once he became too big)
So the story... my tank has been set up for roughly 3 months now. Its a small-ish tank of around 18litres and had at its peak 5 black neons, 5 blue tetra neons, 2 corydoras catfish, 1 gibbicepp and a fighter fish. All was going fine in the tank, water quality fine (I have a test kit) and I regularly do part water changes the tank has all the right bits, heaters, oxygen bubble things, filters, hiding places, plants etc. All in all, I thought I was doing well.
I added the fish gradually with the cat fish going in first, then black neons a few weeks later, then finally the batch of tetra neons and fighter fish. Well... this is when problems arose, mr fighter fish (despite the auqarium lady insisting they were "friendly" fish) started chasing and bullying my poor little blue neons and within a week the dreaded WHITE SPOT DISEASE. So I ran (literally) to my local shop to pick up a treatment... he plague still managed to kill 3 neon tetras and the fighter fish (justice perhaps?). Anyway, the tank settled and I let the fish adjust back to life until 2 weeks ago when I added a male fighter back in (to be fair this one has been well behaved) just because I think they look damn cool, but soon after I started to notice my gibbicepps cat fish looking a bit tired, wasn't eating and well... generally wasnt doing much. I was use to him being the big daddy of the tank always sitting under his bridge and keeping the glass clean and today to my horror I find him DEAD. I cant see any reason, water quality is fine and the test kit shows things are good. Onlt thing I can say is that the gibbicepp had a pale mark on his head. Is it possible white spot could of lived in him for this long before killing him? I've added another treatment of white spot just in case... but I wait your opinions my friends.
Thanks for taking time to read

(oh by the way, if you're wondering why I had a gibbicepp anyway I was planning on taking him back to the aquarium once he became too big)