My tank has been set up for a couple months now and everything was going well until I lost a yellow lab today. I found him on the bottom. I have an 80g bow front with 6 yellow labs, 2 demasoni, and 3 maingano so far. I am planning on upping the dems soon. They are all small (2" or smaller) They have not been fighting and I tested nitrates and nitrites and they are ok. I have been feeding them once a day lately, so I am wondering if he could have been malnourished. Is it a possibility that I was feeding too little? There are no signs of disease etc. Any idea what the cause is? Oh and water changes have been done 25% every 2 weeks or so.