I was curious if anyone knew a reason that pea gravel would be unsafe to use for substrate. I would be sure to clean it very well but I'm not aware if maybe there would be a chemical or molecular issue. I'm asking cause as we all know 150 lbs of gravel at the lfs isn't cheap and you can get 50 lb bags of pea gravel for less than $4. I have a friend that uses it but his approach to fish keeping is "if it dies it dies" and I very much prefer my fish alive. Thanks