Root tabs can cause algea blooms if they are disturbed though. there are no places called lesko around here. Is soilmaster select like potting soil?
Soilmaster Select has one of the highest CECs, in other words, it will absorb pretty much everything you you put in it. What's the difference between disturbed root tabs and dosing the water column? That's where most aquatics prefer to take in nutrients anyway. Soilmaster has no nutrient value (maybe some iron but I haven't seen it confirmed yet, it should have some though), If you don't plan on either dosing the water column or substrate, then you are going to run into deficiencies, in which case I'd go with Eco Complete which is basically a giant root tab. And, FYI... algae happens.
Soilamaster Select, Profile, Turface, Oil dry, Special Kitty cat litter, and Flourite are all chips of fired clay with a high CEC (not so high in Flourite), in laymen's terms they're super porous and will attract and hold nutrients much better than most alternatives. The ones that have been tested since their popularity in planted tanks all have a high Iron content, and I've found info that SMS's prefired clay form (montmorillonite) is very high in Iron, which leads me to believe it has just as much after firing as the rest. They're nothing like soil.
There is a data sheet at the bottom of this page
with information on numerous substrate options, SMS not included because it is too new to the hobby, but you can compare it to the other clays mentioned above. Check out Iron content (Fe), and CEC is listed at the very bottom of each listing.