Originally Posted by fjmcm1947
I have some denitrate coming little white rock looking stuff made by Seachem
Is that Purigen? That's what I use on my FW
planted tanks, it is correct that it doesn't remove Nitrates. Is adsorbs dissolved organics. I have 500ml of it in my filter split into 2 "The Bag"s (which is what you absolutely need, by the way) so I can recharge one and let the other one stay in.
Only a very well established Marine tank of good size and under excellent care will complete the denitrification cycle on it's own. Our LFS
had one of these setups that was up for 10 years and they didn't do any water changes for the last 4 years, just topped it off. Then they moved the store 100 feet to another larger space and since then it's back to PWCs