Hi, I am very new to this forum. I have been taking care of fish for two years now. I have had the tank i will be speaking about since April 21, 2015. The tank is 36 gallons. Right now I have a Redtail black Variatus and a Zebra Nerite Snail. i have had those two since March 12, 2016. On May 30, 2016 so last Monday, I added in four new fish (all female): 1 Panda Platy, 1 Gold Crescent Platy, 1 Mickey Mouse Platy, 1 Sunset fire wag Platy. I thought I saw the start of ich on my Mickey Mouse Platy, but at this point I think i am just paranoid because the ich has barely grown since yesterday. Thinking I had ich in my tank, I bought a new heater since mine broke a while ago. I raised the temperature and it is currently at about 86 degrees Fahrenheit. A few minutes ago I checked on my tank and noticed a little brown thing moving about my gravel. I noticed a few more as well! Of course I freaked out and started researching. At first I thought that i possible was seeing the ich parasites, but then i learned you cannot see them by the naked eye. I think they are Daphnia because they are brown and moving through my gravel. However, all i added in is FISH! not plants.. i noticed many said that they can hitch a ride on plants. I have never had any live plants in my tank at all. I posted this in cleaning and equipment because could the daphnia come on my new heater??? It was in a box without water so I highly doubt it but that is the only possible explanation I could think of. The last water change I did was on May 21, 2016 so a while ago. Howver that still doesnt answer why I am just now seeing Daphnia and why/how they even got here in the first place! I HATE BUGS. I really want to get rid of them even though I have read they are harmless. Can anyone shine some light on what Daphnia do and how to get rid of them and HOW THEY EVEN GOT THERE! Before people start saying that I should clean my tank more frequently, I already know. I am a current high school Junior taking very hard courses on Varsity track. I dont have very much time to test/clean as I did last year.... Any help would be greatly appreciated!!!!!!!!!!!!!!!!!