
So I have been running a scrubber on a test tank with goldfish. At one point nitrates were near 80 ppm (I know this is WAY high, but I did this intentionally with the goldfish). I have done no water changes and my nitrites are zero and my nitrates are about 7 ppm! I do not have the best set up with lighting yet and the scrubber set up only cost me $25, but it works with fresh water! I am going to continue to add goldfish and overstock the tank to see how the scrubber handles it. Looks like I will be building a large scrubber system for the 500 gallon!