+3 to Black Diamond
I swear by Black Diamond for cory tanks also. It's the exact thing as Tahitian Moon Sand. Trust me, I used like 5 bags before I discover the Black Diamond. You can't beat the price of the Black Diamond either. Tractor Supply almost gives it away at that price. I have two bags on standby right now! It makes a great cap over the potting soil in my tanks.
I plant heavy and poke the substrate with a fork as needed to avoid anaerobic pockets forming. I do have MTS, but not enough to make a difference IMO....
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