Yesterday I purchased 4 female guppies for my 20 gal. One of them was dead within an hour of introducing them to the tank and the remaining 3 are huddled together in the top back corner of the tank next to the filter. My males do not seem to be particularly interested and the females really aren't moving about the tank, although they do occasionally switch corners. At least one of them has had fry since yesterday...the only reason I know that is because I caught my danios eating them. I'm just curious if this isolation is at all normal behavior...I'm a little concerned because of the one that died. If they are sick I dont want to infect the rest of my fish. (Oh, and all the water levels are normal...no ammonia, no nitrite, ph 7.6, temp 76)