Now I'm sorry if this posted somewhere but I cant seem to find a list of the ferts I need to have a crack at this EI malarky. Anyone got a link or can point me in the right direction. I'm right in thinkiing that I need to keep using a trace fert as well, such as the Tropica mastergrow? What about more regular Water changes. As the tank is for Discus I normally change 30% every 3-4 days. Would this alter the EI procedure at all? Thanks for any pointers.