A common method of creating "painted fish" is through injection via syringe. Generally, fish are injected multiple times. Fish may also be dipped in a caustic solution to strip their outer slime coat, then dipped in dye. This method is reported to have a very high mortality rate.
Many varieties of "colour-enhancing" foods for aquarium fishes are available to the consumer. Generally, these foods contain natural dyes, such as beta carotene, and are not harmful to fish, although as with other dye methods, the effect is temporary. One source reports that harmful dyes are sometimes used by wholesalers,
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Feeding time, close up of my bristlenose plecs eating there wafers,
Another old video of my 140 litre tropical fish tank, mainly community fish init, with live plants, filtered with an external fluval 205
This was one of my first tanks, have learnt alot from this first tank.
Platys (Orange and mickey mouse i think)
Please check out my blog for further information http://www.tropicalfishmad.co.uk