Hmmm. If the most it indicates is "2 or greater" and 2 is desired, then it can't tell you if you have too much, only if you have too little. But it's easy to avoid having too little. Just add some dipotassium sulfate. I guess you're supposed to test. And if you find out you have too little, you start dosing and retesting until your test results just reach 2. (I put in about 3/4 teaspoon per 100 gallons of aquarium with each weekly 50% water change. That should be plenty and I hvae no reason to think that it's too much.) Scott H. --- Paul Byham <plbyham@bigpond.com> wrote: > The test kit is from fish-vet in the US it is available > from their website > www.fishvet.com. The kit comes with 2 standards which you > compare the test > sample to, they are 1 & 2 ppm, the documentation said the > optimum level is > app 2 ppm, my tank is testing more than 2 ppm, but there > is no way to tell > from the kit how high it is. As far as the tank is > concerned it is a 15gal > 2' x 12' x 18", lighting - 4.8 w/g fluro tubes, Co2 > injection, Ph 6.8, Gh > 8d, Kh 5.5d, Fe .5 ppm, P .5 ppm, temp 25c, substrate is > gravel over > laterite, plant growth is good but could be better. ===== Want to get dirty but stay clean? Diana Walstad, author of _Ecology of the Planted Aquarium_ will discuss soil supplemented aquarium substrates at the 2004 AGA Convention. Convention Details/Registration at aquatic-gardeners.org & gwapa.org _______________________________________________ AGA-Member mailing list AGA-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/aga-member