My Platy is still not doing substantial poos, he is the biggest in tank but his tankmate has been picking on him since i introduced two new little platy's, could this be a factor, him being harassed constantly? (could either put one off, or make you do more i imagine lol) Update, i fed all four a blanched, peeled pea yesterday as someone rightly or wrongly said it aids digestion, and i think it might have done the trick, but still poo watching : )