I have an established 72G with crushed coral substrate. I have been having nitrate problems recently and believe the crushed coral is the reason. I have never really liked the look of the crushed coral so wanted to change it anyway. I have began to siphon out a little bit each day (followed by a PWC
) and have been very careful not to stir up a mess.
My question is what substrate should I use, I am assuming dry aragonite, but how fine should I go and how many lbs would you recommend for a 72 bow?
Is there a cheaper substrate that is just as good, like play sand etc.