Join Date: Apr 2016
Location: Vancouver, Canada
It should be okay, as long as it's washed or baked it should be fine to put into the tank. Read a bit about that soil type in aquariums and it seems fine, apparently if it's straight from the bag and fresh it can cause ammonia spikes though, so that soak and dry method you've been doing is good (besides the mold factor :D). I've done something similar before, but it was peat taken from my backyard and placed in a bin of water, then that water was put in my tank and it was fine with my fish - considering that the soil you want to add is organic, yours is probably a lot safer than the peat water I put in!