FS: SPS Frag Packs - Oregon Tort, PC Rainbow, ORA, TCN, Cornbred, etc.

I have an estimated 89g system volume. I test weekly for Nitrates and find they start to drop a little every 1-2 months (say 5ppm to 3ppm), so I will do one dose, all at once and it will stay around 5ppm for another month or so.
 
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