Hi! New member here. My question is about guidelines on the makeup of "good" fish food. I am just starting out. AP is fascinating and tests all my skills - mechanical, electrical and control electronics. I find myself planning my next system in my head already while commuting! To get my system going I am using goldfish with temperature monitoring and water testing. My AP room is starting to smell like the fish area of a pet store already in less than a week! No seedlings yet, just letting the nutrients come up and getting used to the cycle. I do have some seeds in starter pots. So is there a recommendation for ingredients and percentages to look for in common fish food?

Hi Richard, welcome to the forum

This looks like a nitrogen deficiency since the whole plant is turning yellow. This probably has to do with the number of fish and amount of feed or the quality of the feed. I think you'll need to tell us a bit more about your system. I think nitrogen isn't the only missing nutrient in this situation, it's just what shows up first.

One temporary solution is to use something like blood and bone or vermicompost to keep things rolling until your fish start providing more of the nutrients. At this point though I do think you should troubleshoot first to see if there is an obvious solution.