I have a 110Gal FOWLR
tank that is over 3 years old.. Mostly small fish but one Dog Faced Puffer who is a messy eater. I have always had problems with nitrates. When I got the tank it was already over 2 years old and running with nitrates at 160.
The nitrates were high for along time, aggressive water changes would bring them down some (never below 80) but they would climb back up, mostly due to over feeding. I was new and wanted to keep everyone happy.
Last month I converted part of my sump into a refugium and added a couple of different macros and a cleanup crew to the main tank. Chaeto is the most prominent, I have a piece that is about the size of two fists. Slowly my nitrates have been coming down, for a week they were between 5 and 10 its hard to tell sometimes with the API kit. This morning they were at zero, I checked it again and sure enough zero. My other parameters are all zero.
My questions are..
It this possible to have zero nitrates with a med loaded tank?
Is this OK, the macros have to have something to eat and grow? Or is it that they are just doing a bang up job and have enough to consume?
My red nuance algae continues grow next to the refugium light but not in the main tank, I think part of it is that I switched to LEDs on the tank...
I want to add a yellow tang
and a few more small fish to add color
to the tank.
Thanks in advance!