Here's a question for those in the know. I haven't paid much attention to the need to fertilize. My buddies pond gets runoff from a corn field on one size and a soybean field on the other via two seperate pipes when heavy rains occur. This pond has a healthy green color but also was having problems with thick blankets of algie on the bottom and some above average weed infestation. We've since stocked grass carp at 6 per acre and stocked channel cats (they eat a lot of vegetation) to help control the weeds. However, I'm wondering if the pond could benefit from an additional type of fertilzer or even some liming in order to get it tuned just right. Are they water tests I can perform to evaluate the situation?