They all serve the same purpose. LDL and the stuff Josh's frogs sells is the same thing. I prefer that over the Lyca/Hydro Ball route. Though recently I have been buying bags of rock from Home Depot ($5 or so for a 50lb bag) and using that. Makes the tanks heavier..... I don't typically pick my tanks up and walk around with them, but when I do I lift with my knees...... weak dos equis man joke...