OK. I'm sorry it wasn't clear. Thank you all for responding.
The nitrates died as the Ph dropped below 6.4. All livestock survived. I try not to add too much crap to my water, but as I believe was outlined in other post, I am forced to use RO
water. I bought the alkaline buffer so that it had a longer
and hopefully more successful life than baking soda, which I dismissed.
Crushed coral seems to be the better long term solution, and the dosing was the source of my original querry. That along with whether or not the adfs could possibly withstand a sponge filter and an appeal for other suggestions in light of their fragility.
I have taken a chance and moved half of my poly material from the stable 29g into to ADF
Thanks anyway. Let's hope everyone comes out OK.