Dave, Opps - Sorry for not getting back to you sooner on this question! No excuse really, just playing through a lot of email :-) My RO/DIO unit is a Kent Maxima Hi S 60 gallon/day rate. I paid $250 online which I think is a deal since I saw it in the LFS for $400.00. Opps - but that isn't your question. TDS 0 - literally. I was having some difficutly at first stabalizing the water and getting a buffer in there and watching my ph level. Tried mixing with tap water but my tap is SOOOOO hard and ph like somewhere around 8.5 - the water could never stabalize - or at least I was just too impatient to find the right percentage of mix between tap and my RO/DIO water. RO right didn't quite cut it - at all! Seachem Equilibrium is the best!!!!! Now things are running smoothly in all my tanks (except for that single cell diatom bloom in one of my baby tanks!). Anyone know where I can get dphnia culture? (thank you Martha for the advise!). Oh - and John - how do I get an order of that Blue stuff? Bonny (Ms. Talk-a-lot-tonight - just tell me to shut-up, I don't get offended easily - at least not most of the time during the month ;-) ) _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com ------------------------------------------------------------------------- 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://www.digital.com for "Apistogramma Mailing List Archives"!