I will chime in and say I fought this battle recently and got my nitrates from around 20 to 2 with an Algae Scrubber.
However I have these questions and do admit I am late to the discussion, so I didn't read the entire thread.
How deep is the sand bed and do you vacuum the sand?
Whats your feeding schedule?
"Z"
Feeding daily one time , my sand bed not that deep around 4 c.m
. With that said give what you have a chance to work. Biopellets are a form of carbon dosing and so I vodka. I am personally like him in the sense that I don't like putting something foreign into my tank like vodka. I think right now you should keep up with your maintenance until your new test kit comes in and you can test your water.


