I don't really have issues with this as a substrate in whole, just that my plants just do not seem to want to grow in it. The plants aren't dieing or anything just very slow to show any development. Can't tell you the last time I actually trimmed any plants in this tank.
Here are some specs: well established 10g tank, high light, DIY CO2, EI dosing with Flourite as the substrate. Photo period is 10 hours. Temp sits around 76-78 for the most part. I keep the nitrAtes around 20.
Right beside this tank is a 20long which is similar to what was mentioned above with the exception of the substrate which is pool filter sand. Plants grow very well in this tank. Stems need trimmed every couple of weeks, crypts throw out new pants, java fern is just a massive beast of a plant.
All my other tanks I use SMS and they far out perform all the others.
Just think it's time to swap out the Flourite. Maybe go with a mineralized top soil or something. Anyone wanna trade? :icon_roll