Hi folks,

I'm having Seachem Onxy sand as substrate for my mini outdoor pond.

Someone sabotage & all my plants are dead overnight. Strangely, none of my fish & snails are affected.

I didn't pull out all the root for the dying plants. I now ended up having anaerobic substrate. I've scooped out as much as possible, washed & sun them but still having the sulfur smell when the substrate is wet.

Is there anyway I can recover an anaerobic substrate?