Looks really great, you did a great job. If I were you I would give it a month to grow in before you buy more plants, just in case you have a diatom bloom and make sure it doesn't choke out any plants. Almost all the plants I sent you have a crazy high growth rate and should grow in pretty quickly - sub 1 month- to be tall for the girls. Much easier to clean and water change for the diatoms if the plants aren't quite as crazy tall and packed in there. Sometimes it's hard to get it all cleaned if you have to many plants stuffed in. After the first 2 months or so any diatom blooms you have should be gone.
The snails look very happy, glad you are all enjoying them and they found a great new home. I have TONS of babies growing and just had 2 more clutches hatch yesterday of the dark purple shell/ dark purple black foot - can't wait to see what the babies look like from these.