Anaerobic soil--fact vs fiction
I would like to utilize some steep slopes and deep substrate in a new tank Im planning--however, the thought of toxic gas building up in bubbles under my substrate just waiting to kill all of my fish is a little intimidating.
Is there a rule of thumb for how deep you can go with different substrate materials without worrying about the gas build up?
Is there a method that works to keep it from building up other than trumpet snails?
Thanks in advance for any input.