Bio pellets IMHO are a pain in the azz. I vastly prefer vinegar. It is easier to adjust, cheap, and doesn't clump. That being said, both are not a quick fix to nitrate reduction and should only be used if really necessary. It took six months to have my nitrates 0 out from 15 when I started. Honestly, I see minor improvements in growth. My sps grows the fastest when I keep my Alk very steady and my po4 very low. IMHO a doser is one of the smartest thing a reefer can buy if dosing is required.
IMHO, not enough emphasis is put on phosphate(po4) reduction in the hobby when people first get into it. Same with Alk. Too much focus on ph, ammonia, nitrite and nitrate. Po4 is far more damaging and problematic in a reef system that normal levels of nitrate, let's say 20 or less. I think one of the best tools is a good eye and a Hanna po4 checker. I use Gfo plus phosphate e.
Also with Alk. Too much focus on ph. Should totally focus on Alk and consistency with it and slow change. Ph, almost no point in checking it.
If you are reading this and you dose Alk, add it to you top off water if you use an ato.
Btw, the growth of softies is much faster in my second tank. I throw in a bag of carbon/Gfo every month or so, do an occasional water change and never dose or test anything. Xenia, gsp, mushrooms, daisy polyps, open brain, candy canes, and other stuff like that. Much of which die or fail to thrive in my big clean tank. They love my little tank. Certain coral do best in my big/clean tank and others do best in my little/dirty tank. Some do fine in both. My point is coral selection should be made on what kind of system you are keeping. The two easiest ways to kill stuff is alkalinity swings, and high po4 for corals that need low po4.