Does anyone know anything about these? I was thinking of putting them under my sand substrate since they seem like theyd be easier to separate from it, i dont know how much of a mess they make and i kind of want to keep my sand looking clean. Also, should I use a fertilizer water additive along...

I accidentally added too much fertilizer(API Plant Food, liquid). Will it harm my java ferns? I have 4, 2 babies that sprouted from the leaves, one that has no leaves, but its rhinozome, and one that has two leaves. It turned the tank water a light yellow. It is a medium kritter keeper(a 3.2...