Hello, I’m recently retired and bored, so this is next🥹I love aquariums but don’t know any aquarist’s. A couple friends have tanks but have trouble keeping up, it seems. I have spent hours at Aquarium Science website and he’s very supportive of Cory and this forum. I have a lot of “stuff” en route via Amazon, and am building 2ea 30gal tanks. I need to buy substrate asap and am leaning toward EP oil absorbent made of pure montmorillonite clay (coarse), or Quickcrete’s pea pebbles which have a max size of 3 to 9mm. I’ll post this then start looking around.