Sorry, I'm no help...don't even know what they are I did a search here, was wondering if it was the fish??? that Mystic had posted a pic of...but can't find it.
Are you talking about keeping it in with the goldfish?
I have 3 goldfish and 2 ottos in my 10 gallon. The only thing I find gets really dirty is the front of the tank...on the bottom, in front of the gravel if for some reason I don't vacuum weekly in that spot. My water stays good ammonia 0, nitrites 0, and pH usually between 7.2 & 7.6 (leaning more towards the 7.6).