I used the Flora Base Pro powder type to cap the akadama and use as front substrate for the hairgrass carpet. It is very light in weight and very easy crushed into powder.
Because it is so soft and spongy it trapes a lot of air and becommes even lighter. This makes it a rather unpleasend substrate to work with when planting a lot of small carpet plants like HC, MC or hairgrass when tank is flooded. After it is soaked for a while and all traped air is out this becommes little better, but then it will becomme so soft that it'll fall apart.. Also with vacuuming the substrate, more substrate than dirt is sucked out.
Also looking at the price which is rather expensive i think there are better choises to be made..
It was this substrates light weight and because it shifts so easily i needed a year to get my MC carpet dense.. Because i could only plant single stems rather very far appart. To close together and larger bushes didn't hold just floated up again.. One word it "Sucks", actualy i wished it would suck a bit more and hold plants in.
Tho it grows plants very well once they are established..
I would say if you realy know what you are doing, dry start the tank and have no need to switch plants around and do some rescaping later. And leave it as is till the end of time, it is ok to use.. I guess that's what the "Pro" stands for, are you no professional and like to experiment or need to switch plants around after flooding do not buy Flora Base Pro, it's a pain in the but and a waste of money.