colour loss

Morning everyone, I turned on my tank today to see a (maybe?) very sick dwarf honey gourami. I noticed his colour was fading about a week ago but I assumed it was to stress from a large water change (half the tank) due to one of the fish eating and killing a tetra (ammonia had spiked slightly...

about 4 days ago I moved my fish in my 38L tank to my new 90L tank, while I was catching my yellow Molly named Frazzle in the net, her tail started changing colour, the next day I noticed her tail, dorsal and anal fin were transparent and when i turn the blue light on the top of her head is also...

Here are pictures: He's also lost colour, any idea what this could be? In the past he had growths near his mouth but I think they were harmless as they went away on their own.

hello all,    i need some advice about my german blue. when i bought him from the pet store , 2-3 months ago he looked perfect , with all its colour and full of energy. He eats and swims around all the time, doesn't seem to have any issues with the other fish. But although in pet store he had...