Have been using this product since 2010 and have had great response. Coral color improved, polyp extension improved and all corals from SPS to softies responded well to it. Recently used another newer product out there and did not get as impressive a response as I did with Pohl's. I started dosing every other day and once my SPS frags turned into mini colonies I started dosing every day. It is $$$ but well worth it and BRS has sales on it quite often.

I see no difference in PE, color, growth...anything really after using the entire KZ line. My tank is full of SPS, all with good color, good health and growth. We've all seen the photos of pastel tanks....not the case IME with these products. They haven't done anything of note since starting the regimen.

I had to buy a bottle of this to continue with my nano package. I don't use the aminos because I use two little fishes acro power. I am not running an ULNS so I am unsure if I am seeing the full potential of this product. Corals seem to get brighter by lighting the flesh while the tips remain the same color. I am not 100% confident in this product. I am going to discontinue the use and see what happens to my colors.

Ok so I've been using it for about 3 weeks. Dosing at 3/4 strength bc everything I've read says full dose is to much. And I can say I only see slight if any improvement in my coral's color and polyp extension. As to growth. IME You cannot make an observation based on only 3 wks so I wont comment.
I wouldn't recommend this product. Its to expensive for minor results

Used in moderation with proper filtration and optimal water quality, results show in less than a few weeks... Increase in coral vitality, growth, color, and polyp extension.

I recently bought this product and really like it. The only thing I recommend is to not over dose. I dosed the recommended amount and it was too much. So id say go half. Other then that, it works great!

I've been using Phol's Xtra for 1 month now. Some coral colors became brighter and others stayed the same.

I believe you need to have very low nutrients to see results with the Zeo products but, if you do, the ability to tweak appearance using these supplements is crazy. I use this to bring out more color in all but the tips (they seem to stay the same color as they are) when I want my corals to pop a bit more. I usually see results within a few days of starting dosing. If I stop, it'll take a couple weeks for them to change back. I now do about 1/2 recommended dose twice weekly and I love the results. I am sold on zeo products, however, beware. They are not for the novice as dosing is very particular to each system and, if it works for you, you will want more of their products in order to micro-manage more elements of your system.