So on Monday three new guppies were added to my twenty gallon tank, bringing the total number of fish to seven (5 female 2 male). I have noticed that two of the seven have been somewhat distant from the others. They are staying towards the top right hand side of the tank, however nothing seems to be physically wrong with them rather just a change in mood. They eat and move about the whole tank occasionally, but stay in that top right hand side for a good part of the day. Can someone maybe enlighten me a bit as to why this is?