Hi everyone, I'm currently fishless cycling a 60l tank and I've read that using seachem stability is not recommended due to the bacteria being non-sustainable? So I've stopped putting stability in and I'm going to use ammonia to feed the bacteria instead of fish food, with the hope that sustainable bacteria grows in the natural way. However for the life of me I cannot find where on earth to buy this ammonia! I'm based in U.K., is there anyone who can advise on where to get the ammonia and what brand? I'm worried I'll buy one with soap or other additives that we don't want. Thank you!