This is what I don't get. Erythromycin is for gram positive bacteria in most links I can find (see below, although you have to scroll a bit ).
But I've seen a few threads now using this and ammonia hasn't lifted. Has anyone had troubles with ammonia and using erythromycin??
I believe nitrifying bacteria are meant to be gram positive however have seen one article that said they are actually gram negative but behave as gram positive - whatever that means.
I used peroxide so I wouldn't be bombing the system. Now I'm starting to wonder if erythromycin would have been fine.