2 weeks ago I went away for the weekend on an orchestra course and left my 2 fish tanks with my mum in charge.
When I got home on the sunday afternoon my mum said that she couldn't seeo ne of the guppies any more in the 7.5gal tank, and when I had a look I could only see 1 guppie in the tank as well. I checked everywhere. I moved the plants, lifted the rocks and decor, moved the gravel around a bit but there was no sign of him. I've done a couple of water changes since and still no sign. There's no way he could have jumped out because the lid is attached the the tank and you have to unclip it to get it off, so i've ruled that one out.
My dad suggested that the one I have left may have eaten him if he died.

But im not sure. What do you think?
Thanks
Gwenz
P.S. - The one guppie I have left seems very healthy and eating fine and swimms around just about everywhere in the tank.