Rising nitrates even after water changes!
I have a 10 gallon heavily planted tank. Semi full carpet + 65% bio mass in stem plants overall in the water column. High tech pressurized CO2 with dry ferts. 30 watts T8 (2x15) 6500k bulbs. Gh 6 , Kh 4 , (Ph 7.3- 6.7). Twin canister filters. Flourite substrate. The tank currently has zero algae visible. The system is now maturing into its 5th month. The plants are growing well with good natural colors. The tank only has 2 cherry shrimps & a small snail population that was getting out of hand so I culled about 80% of them because they were eating some of the plants. I am almost ready to do a re stock of 5 small Amber tetras waiting in quarantine now. The question is: My Nitrates were as low as 5 ppm after water changes in the past , say 30 days ago. Now after doing regular weekly water changes I can not get my Nitrates down below 20ppm's even when I know my new water going in is less than 2ppm's??? I feed the shrimps ( Repashy Shrimp Souffle ) a small chunk every other day & thats it. Could the growing snail population be causing the Nitrate rise?? or the food. I have been having trouble vacuuming the subsrtate because of the plant density & carpet. I stopped dosing KNO3, for the last week even though I follow the rules for dry ferts. Nitrate stays above 20ppm's know matter what I do. I use to dose 2 or 3 drops per day & the tank would eat it right up now even though the tank looks great the Nitrates are staying high. Any ideas???? Thanks
Last edited by Hardstuff; 12-26-2012 at 06:30 AM..
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