I've used this brand. Their Formula 1 (and 2).
This stuff is pretty good. You WILL see a difference in the coloring of your fish the next day. Brighter, etc.
My corals like the residual debris from these cubes too.
But yes, they (like almost ALL foods) do have some phos.
My main complaint about this specific food is...more so than ANY other food I've used, this WILL make your skimmer go NUTS. Severely nuts!
So while I personally like this food...whenever I use it, I shut off the skimmer for a couple hours, then..I turn it back on and keep a VERY close eye on the skimmer for the next 4 or 5 hours after that. (or dial it down really low if you go to bed relatively soon after).
The formula 2 (specially for
Algae eaters) I have a much lower opinion of. My tank is mostly algae eaters (Coral Beauty, Tang, LMB) and they eat anything. But none of them touch this stuff. The ONLY thing in the tank that eats the formula 2 is the hermits...and only after they've searched everywhere else and are done.