I followed all the instructions to set it up. Every day I take the little plastic pipette that comes in the kit and blow bubbles in the water, it says to do it for about a minute every few days but I do it every day and I just count each time I put it in the water and blow bubbles up to 60 times. I feed them every 3 days like it says and have no problem with cloudy or dirty water. I am not worried about running out of food at all! I keep the food in a plastic ziploc bag. There is some sediment that sits at the bottom that gets swirled around when I do the bubbles in the water but it drops back down quickly and has not been a problem. I leave them in a room that fluctuates in temp because the AC is on during the day but off at night and even that obviously hasn't been a problem. I do have them under a "plant light" during the day so it is like they are getting a full days worth of sun and I don't know if that is why I have had such success with them or not.
After reading many reviews I was worried that I would end up with only a few or maybe even none. I want to tell you that my experience has been so great with them that I would do it again in a heartbeat! They are so awesome to watch especially with all the different sizes! Sorry this is so long! I just wanted to explain as much as possible so you will buy them and have a great experience just like I have!