I had mine in my 20G for over a year and had no problems with it stirring up easily. It does stir up, yes, but it always settled easily and never created a huge mess. I think it is fine on its own if you choose to use it, but like Fish Newb says, it does break down over time. I just don't know that covering it with another substrate will change that fact. It is meant to be used on its own, and it is just a product that is not going to last long-term. I think there's just no getting around that. I had to break down my 20G for space considerations, so I can't tell you at what point this substrate will start to significantly break down and begin to become muck, but I have read here from others that it definitely does.
It certainly wouldn't be my first choice for a substrate. It was okay for my purposes at the time, but I can't help but wonder what kind of mess my tank would eventually have become. When it came to setting up my next, and larger, tank, it was with Ecocomplete. I definitely prefer it to the Florabase. It looks nicer, imo, it's easy to plant in, and I believe it will last a very very long time. I'm now in the process of setting my 20G back up, and it is with Ecocomplete.
My next aquarium that's in the planning stages I'm thinking of trying the ADA Aquasoil Amazonia if I can get it without too much hassle. If I can't, though, then I'll be happy to go with Ecocomplete again.
Pimpin' the Eheim at #153
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