I PM'd you some pics......
I don't use just sand only about 1 inch on top of the soil to hold it down-I don't use or need root tabs-but with just sand I would use root tabs. I get my sand at walmart for $4/50# play sand for kids sand box.
When I use kitty litter I mix it 25% litter and 75% soil-if I use peat- I only use a hand full at most dusted on the bottom under the soil
Kitty litter can be a mess when used 100%-you also need to make sure it is just clay and not any of the perfumed type or with any additives or it will kill the fish-the wal-mart red bag brand is what I used-how it is made from one state to another can vary too so look at what is in it
Personally I would stick to dirt or potting soil and only add a handful of the clay kitty litter for the iron.