As many times I got valuable information from this forum, I want to share my new experiences to pursuit the most crystal and clear water I can. I have three tanks: - one AIO hospital tank running for 4 months. It has 20 gal, Tunze DOC 9001 skimmer, one box of Marine Pure biomedia balls. No sump, no refugium. The tank has 7 green chromis, one yellow tang, one powder blue tang and one emperor angel. The fishes are in this tank for 2 and half months. - another tank with 15 gal running for one month as a quarentine tank with Icecap RS 15 sump and Skimz SM163 skimmer. No biomedia and no refugium. The tank has four clowfishes and two anthias I got last friday. Since last week I started to run an Aquamaxx TS-2 sulfur reactor. - main display with 125 gal, 20 gal sump with refugium, one box of Marine Pure biomedia balls, Pukani and Reef Safe rocks from BRS and Vertex Omega 180i skimmer. No fishes yet because it’s a new tank (first week). In all three tanks I’m not using carbon/GFO. In a two little fishes 150 reactor, I’m running Seachem Purigen (in a media bag) with Seachem Matrix with a 400 gph pump. In low flow areas, I put a media bag with Seachem de*nitrate. I spent $42 with all the three stuffs above and got all from amazon. The three stuffs quantity are enough for my 3 tanks. The results I’m getting are very impressive. I never saw my tanks with a prestine crystal clear water as I’m seeing now. And the water tests are perfect: no amonia, no nitrate, no nitrite and no phosphate. And I feed the fishes 3 times a day ! I’m trying these three stuffs because I always thought carbon as a waste of money and I started to research new stuffs. When we have some trouble with the tank water, the carbon can’t help us to reduce amonia, nitrite, nitrate or phosphate. Another “issue” is the life spam. After no more than one month (in avarage), carbon needs to be replaced. The only situation that I think to use carbon is when I need to remove medication from the tank water. Another thing I noticed is that all skimmers are working “less”. Seachem Purigen is a regenerative stuff with bleach. After six months (in avarage), I’ll need to soak Purigen in bleach and in two days, they are good to go again. De*nitrate and Matrix don’t need to be replaced or regenerated. The first tank I used the 3 stuffs combination was the hospital tank and it’s running all the three stuffs for 2 months. Now I’m using the three stuffs in all my three tanks with very impressive results. Sharing my experiences, I hope to help another fellow reefers to get crystal clear and prestine water and saving money and time to enjoy the hobby.