You can get a jump on fertilizing by going to Wally World and getting about 4-5 bottles of Miracle Grow Liquid fertizer and putting it in now. There won't be much chance of over fertilizing at this tim of year. I agree With DD1 that you wouldn't get a whole lot of spawning from the FH, BUT they will do well in a muddy pond and if they are grown FH, 50 lbs will add about a million fry for next spring.