Hello, I am a complete newbie and the one who asked the question so my answer must be taken with that in mind. Profile is a similar product to fluorite but much cheaper. It is a fired clay product but has no nutrients added like I believe fluorite does. It is sold by Schultz as aquatic potting soil or at Wal-mart as soil conditioner. The only difference between these two products being cost and grain size. The cheaper stuff at walmart is only a little smaller in grain size than fluorite. I got my info from the krib website. It seems that many people on the aquarium plant digest have had good results with it. I want to use it in my new tank set up because I would like to find a cheaper alternative to fluorite. In closing can anybody tell me how often to check my PH after reach my target number, or is that something I will just have to play around with? Teresa ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!