hi there i have already gathered some good information from some people on this site regarding using RO water in aquariums, im just wondering what you guys are adding to your RO water to replenish the minerals lost threw RO. i have been advised to use Equilibrium, should i also use some kind of Trace? one thing to keep in mind is that my system is quite large 2000L so cost plays a big roll in dosing my fish with products. thanks in advance for your help and ideas dave. :hi: