I know and I keep looking at them but, my tank has guppies and well only one Molly now, so i didn't want to fill the tank with all fish that swim in the middle or top, so am finishing off the tank with Cory's that will add a little something to the bottom. NEED A BIGGER TANK!
Lol I will freely admit I am overstocked but my parameters are fine. I have only got a 64L tank with:
1 endler
1 male guppy
2 female guppies
2 small lyretail mollies who have been in my temp care for about 2 weeks but I haven't heard back from my mate when he's taking them back

5 cories
and of course my 8 fry who will be going to the petshop in a few weeks
To look at - the tank always looks empty they are always swimming about amongst the plants and stuff. I do a 10% water change every morning due to the fry and I do a 50% change every sunday so I think I am fine for just now.