I'd prefer to go aerobic, it's just overall better for container gardening, where biota's growth is really limited by the size of the pot. If you don't know what you're brewing without oxygen, there's a chance you're gonna introduce a pathogen into the soil, which is gonna start causing problems.

BTW kelp is good, just don't go overboard with it as it's mostly potassium, so can easily push it up too much in soil.