Sounds to me like the tank hasn't cycled yet. There may be ammonia in the water that's what's causing the cloudy eyes. Get some zeolite for the filter (looks like small white rocks) and keep doing water changes if the ammonia shows up on a test kit. Don't clean the gravel or filter for atleast three or four weeks, and no more fertilizer for a couple of months. Add nothing but iron for plants in a new tank. PS koi and gold fish may eat the plants.