my frind has a 55 gal tank with a scat, pacu<baby>, and 6 monos<about 4 inches> well, she has super high levels of nitartes and nitries, they don't even register on a test strip which are API brand, she has been doing about 50% water changes every couple days and the levels are still the same afetr abuot a week of doing the water changes. she has tried amquel, nitrazorb, and the tertra brand water conditioner for the frequent water changes and gravel vaccuing and nothing has changed. the tank has been up for 2 months and the fish are still quite small but I there is no more room for other fish in there. and the odd thing is is that no fish have died? and I am stumped with the tank, any thoughts?