(Sorry i haven't replied, ive been at work pretty much all day.)
Hi shelaghfishface, still only the one, and he seems okay just chilling out of top of the columns as they're quite sheltered by the Amazon swords at the back. I dropped in some crushed flakes earlier and he managed to eat some before the other two came up and finished it all off. I was thinking about a fry net so he can eat without all the competition for the food.
Thanks for the advice pippoodle. I was thinking like starting with a group of 6 corys so i still have some space for a few other fish as well. And then maybe add more at a later date if i still have space for more fish.
Also good news everyone. I have managed to find a fish breeder willing to donate some filter media. I'm going to pick it up on Wednesday. Do i just shove it in the filter and leave it for a few days or what?