Haven't used too much Seachem stuff, but of the Seachem things I have tried, I like the equivalent Kent product better. I actually don't supplement much to my tank. I change 5% of my water twice weekly using IO salt, then I top-off all evap water with Kent Kalkwasser mixed 1 teaspoon to a gallon of RO/DI water. I used to dose Iodine on occasion, but I stopped doing that almostg 6 months ago and have noticed no adverse affects to my inhabitants. I find that the frequent water changes does much more to benefit my tank than supplements do... and it's costs less to boot.