Hi, i have several plants in my tank, and i was wondering if regular gravel would work. I've had my onion plant in there for months, and it seems to be doing great. I've added javafern and sword plants in there. At the lfs, i found something called laterite, wat exactly is it? It says plant substrate. Thanks in advance.

Those plants would do good in your tank the "laterite" is like a substrate that you mix with your gravel instead of buying just a big bag of substrate When I had a planted tank I had Redsea substrate only in there but the problem is that after 3 years you have to take it all out