There are 2 types or brom in the 1 month old viv, and one form in the new viv,
Im not sure exactly what they are all i know is i was told there some form of Neo.
I got them from home depot for like $3 a peice or something close to that. and each of them had pups. I heard some people have problems with them rotting, but so far mine are doing very well, They also hold water in the cups and center pretty good. All i did was trim the roots back before i planted.
I forgot to add updates pics of my 20H'
This one is maybe 2 months old or so. This was my first viv i did from scratch.