Hi, does anyone could explain me the difference between RO water and de-ionised water (by Seradest method). As an analytical chemist, I can't really understand that my rams seems to dislike the Seradest water witha conductivity of about 0.5µS/cm ? What couls disturb them with such a water ? We're speaking of µS, so what could be the problem ? (I use seradest water to dilute my tap water, rams were acclimated with my very hard tapped water (hardness about 20) for one week, then I diluted it to a hardness of ±12 and added peat filtration. Then one week after, I diluted again to a hardness of 7. This last move, they dislike and ±40% of them died (those are german rams, not the shitty far-east quality)). Anybody got an idea ? I'll let my apistos with a hardness of 12 until I understand more of the problem. I just have acces to free Seradest water, not to RO :((( Some more personnal: anyone from Belgium (Brussels or Brabant ?) ------------------------------------------------------------------------- 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"!