Need some help with my sick fish
water test are
ammonia 0ppm
nitrate 20ppm
nitrite 0ppm
my tank is 55 gal I had 9 guppies and 5 panda corys 4 ghost shrimp
I lost a guppy yesterday and this morning I have another down I took both fish out to examine them and I couldn't find any marks or spots or anything different.The guppy is hanging out at the bottom of the tank near the heater anyone have a guess of what is wrong
P.S. I am having alittle problem with brown algae right now could this have anything to do with it?
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I don't have an answer but am posting so this question will go back to the top and be noticed. I am sorry you lost your little guppies. 
