Fishyfreeonz
Fish Fanatic
That is just a really bad picture. That coloration doesn't exist in real life. It's just glare or something.The picture in post 2, the red fish has a creamy white film over its head and body. This is excess mucous produced by the fish to help protect it from something in the water that is irritating it.
Is the Thrive all in one fertiliser for aquariums or gardens
Thrive is an aquarium fertilizer