I also try to avoid additives but Gannet bought lots of treatments with his tank
used the TLC tank start cycle thing and seemed to run well, I try to avoid the rest and watch the fish for changes, lets me know when things are wrong
the tingle in the fingers lets me know when the heaters broken, lol
I think a lot of the worlds wild fish are swimming in chemical baths even marine fish in some areas are putting up with our waste products or amazon fish, deforestation changing their water parameters
silt from up valley land developments have changed the inner harbour in Tauranga, they used to land light planes in one area now the mud is calf deep and they would have to dodge the mangroves