Bioballs do not create a nitrate problem...people create nitrate problems...
Bioballs are normally a plastic item hardly capable of creating any type of chemical reaction....
Nitrate is the result of nitrite being broken down...nothing more...and nothing less...
Cured vs. uncured live rock...
Cured-The organisms in which die off (normal) during the harvesting of the rock, transhipping, etc...have already been removed through the curing process..
Uncured- you will have to cure the rock (removing the normal die off) yourself...sometimes lengthy process, but, with curing it yourself...you get far more organisms which were on the rock, pods, hitchhikers, etc.
A "real" saltwater filter system doesn't begin nor end with ecosystem...
A "real" saltwater filter system is a filter in which will adequately filter your water...nothing more...nothing less...it is not brand specific.
As for the lighting being off...this is to help prevent an algea bloom during the cycle/curing process...some people do...some don't
Visi-jet protien skimmers (with my personal experience) are nothing more then rubble...
By reading your first post...and then your follow-up post, it seems as though you are not doing any research into this hobby you are embarking upon...
You should consider alot of research into the aspects of the hobby...learn about the very basics, then continue on with your pursuit. The more you learn now...the less you will have to try and learn when you encounter problems...