It is the safest and most effective ime. I've used several. I was one of the many that got taken by Blue Life's crap back in the day. They were lantham or whatever and it dropped PH, alk and I lost sps and a yellow tang to that $heeeet. Boyds if used right works really well.
Well is working for me as well but what happen if I don't do a wc? I work grave yardsand I don't have time to go and buy water so I really need to know the answer
Just left the skimmer with out a cup in top after 8 hours of it being off. Oh and I pointed my power heads up to pierce the surface a bit for aeration.
It does work but follow the directions. In my experience the cyano will eventually come back if u dont find the soirce of your excess nutrients. I am having that problem being lazy- I might start a little gfo