Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Golds as fish are a bit messy, some seem to dig a lot, and some are not great at eating all their food.
They have a reputation for producing more ammonia than similar sized fish.
Where do they get the ammonia from? Essentially it comes from the food they eat. Since they are larger fish than many that we keep, we feed them a lot, and this counts as plant fertilizer, whether they eat and digest it or if they miss it and the microorganisms digest it.