If you can, see if you can find out what your other levels are. NO3 at the levels you're talking about shouldn't cause algae unless the others are too low for the plants to use the NO3. You don't need a $225 LaMOtte kit. These will do very well: http://www.drsfostersmith.com/product/prod_Display.cfm?siteid=6&pCatId=4558 at $53, it's not cheap, but it works and you can read it which is more than can be said for the $5 and $10 hobby kits out there. And it works in a range that's useful. http://www.drsfostersmith.com/product/prod_Display.cfm?siteid=6&pCatId=4559 $59 but it reads PO4 in a range that's useful. The cheapo pH kits work well enough as do the titration kits for KH and GH. If you want to spend less than LaMotte, you ight try the SeaChem kits. They are priced more like hobbyist kits and work okay if you time them just right. I had trouble reading them but others are happy with them and Seachem's pretty good outfit to deal with. Genuine interet in the the hobby, no snake oil or yadayda advertizing claims. If you want to avoid doing tests at all for P and N. You can dose and then use huge (50% or more) water changes frequently/regularly to limit overall levels in the tank. Scott H. __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. http://search.yahoo.com ------------------ To unsubscribe from this list, please send mail to majordomo@thekrib.com with "Unsubscribe aga-member" in the body of the message. Archives of this list can be found at http://lists.thekrib.com/aga-member/