I use just fertilizer the few times ive use organic carbon it seemed to kill off a few of my sensitive plants and cloud up the water im not sure why though.
I dose Kent Grow (micro nutrients) and Kento Nitro+ (Nitrate) for my plants. I avoid anything containing even trace amounts of copper to make sure my shrimp aren't affected. I also dose Flourish in one of my tanks that doesn't have C02 added. I have no problems in any of the tanks with my shrimp.
-Aphyosemion
Yeah, I meant Flourish Excel. As for the copper, I may not be able to avoid it completely, but I have to damn close. I would be interested in hearing if anyone else has had problems with copper containing fertilizers, such as the Flourish version. I forget what it is called.
-Aphyosemion
I was dosing my tank heavily with Flourish, and never had any problems. However I have heard of someone dosing an extreme amount to raise Iron levels having shrimp death. I think if you dose according to label and do regular water changes there should not be a problem.