I've used about every plant substrate on the market. I love florabase but found that if I had any diggers it always got kicked up in the water column. Most of my planted tanks with CO2 injection have seachems onxy sand on the bottom for KH reasons ( our water is around 1 dkh coming from the tap out here). covered by flourite and topped with eco-complete. Carib Sea has a new soil out ( they make eco-complete) that has almost the same chemical make up as eco- complete, but is a fine black sand. Kahuna potting soil is the name I think. I used it in one tank and found that it need to be covered with a heavier top layer, but I can't wait to see how it preforms. I have it mixed with frourite and tahian moon sand.
