As an old reefer who has tried just about everything............
I had a carpet anemone for 7 years. Currently I have 3 bubble tips, the "mother" anemone (two are clones of the first which split in my tank) has not moved in two years. Generally, and THAT IS GENERALLY, anemones do not move if they are happy. Once established. But if you change the slightest thing, current, light, additives, etc., this CAN cause them stress and they will then look for that "perfect spot" again. The key is to keep your tank balanced and once you have found what works, don't change anything.
About additives: there are many differing opinions on this one. I add absolutely NOTHING to my tank. I maintain regular water changes (once every 6 weeks----go ahead moan now........), I drip Kalk every night, and I add Kents ProBuffer dkh in the morning before lights on.
My corals are literally growing out of the tank.
I just wanted to give you another opinion on this subject, and as I said, there are many.
Find what works best for you and then stick to it. Many mistakes can be avoided by NOT trying what everyone else is doing, thus causing these constant changes in the chemistry of your own tank. Each and every ecosystem is unique and dances to the tune of its own drummer.
My humble .02
HTH
Hermit