I have used: Xtra special -probably a good product but you really have to be dedicated to keep a proper routine. b ionic- no change vitalizer- corals love it but I feel funks my water if you use it all the time. So basically it's pointless for me. cyano clean -no change zeo zyme -no change coral snow- probably does make water clearer. aminos coral booster k balance- just don't need it with my calcium reactor iodide- maybe necessary if not a water changer type person. Flatworm stop.. good for corals.. does increase slime but still a waste of money. I have an unopened bottle of spur I haven't used yet. I hear good things but it sound dangerous if not used properly. Some of these probably work to a certain extent if you are aggressive enough but they also feed bad things. Sometimes I can tell a day after that it made my cotton candy algae worse. aminos, extra , vitalizer specifically. It also makes the routine a lot more complicated for turning off carbon and/or skimmer remembering to turn it back on. I do use : Zeobak and zeo start and zeolites which I will continue to use. I really like the stones. The biggest thing that helps my color lately is aggressive effort of detritus removal/ vacuuming /using powerhead all around my rocks/filter socks/skimming..and water changes/good carbon. Maybe worth a mention I use extra coarse carib sea calcium reactor media that has a near perfect balance of Calcium/alk/mag/ potassium and strontium and who knows what other minor elements. I use a very small amount of zeomag.