Got it

Thank you so much, Diana! Today I finally got the rest of my plants, and I immediately planted all of them. Turned on the light as usual; new ones are R.macrandra, sunset Hygro, a Crypt lucens, L.repens wide leaf, and another Ludwigia spp. I forgot what species(got this one at Petsmart) They are planted in this 2-gal bowl, in the center. Surrounding them are hairgrass all over. Well, not all over, yet! I bought one pot of it, and so I divided it into 4 portions, planted them all around the bowl. I am hoping once they settle in they will grow to surround the plants in the center. Lighting is a 13W, 6,700K bulb. Substrate is potting soil and gravel; followed your advice. Just wanna say thank you again!
Paul