Am not sure exactly what your dish is made of to act as a catalyst but it shouldn't just stop working IMO. Are you sure your peroxide hasn't lost some of its potency over time?@brandon429
My tank has always had a chronic lack of oxygen during the night, because im not running a skimmer and i lost lot of animals due to that. Therefore i was running an aeration stone during the night. I got interested in oxydators due to their ability to supply oxygen, but im not confident enough to fill them up rigorosly every week. Therefore i have build a custom dosing pump which is constantly dosing tiny amounts of H2O2 into a perforated ceramic disc.
I am dosing 5ml/10g 12% peroxide. It worked for a while but last night i have observed my fish gasping for air. This is the maximum i can dose with my corals still being unaffected. Does that mean i have remove all organics and now the peroxid is not able to release oxygen?
Seems like i'll have to reactivate my Air Stone. Is it possible clay/ceramics/concete get "used up" by peroxide and lose their catalytic function? I will buy a peroxide test to check the amount in the water but im expecting to see a lot.
Why not simply revert to using your oxydator and fish a % of peroxide with number of catalysts that work for your tank, corals and fish?