Thank you all for your responses.
No problem. Out of curiosity, which species are you considering?
I was thinking about bronze, as I believe they are the easiest to acquire in our local area - having read all of the above comments I may go for pandas if they would be better suited to the aquarium though.
In a 14g tank, he really can only home the smaller ones suitably. Playsand is often used as black sand.. and is really the only black sand I have heard of actually.
I apologize if I sound nitpicky but I feel it only polite to inform you that I am a she :). Thank you for the advice!
Depending on the footprint, the bigger species should be ok. If it is a hex tank and has a tiny footprint, obviously not, but in a longer tank, I don't see a problem with the bronze-sized species. They aren't *that* much bigger than the pandas, it's only a centimetre or so difference.
It's a 14 gallon long, I had thought it would be okay - but I am not entirely sure now.
I have since washed the large grained sand and added it to the aquarium. I can try and get a photograph of it in comparison to my hand if any of you would like, perhaps that would be better. But yes, as for clarification: the aquarium is a 14 gallon long, the footprint is roughly 30cm x 60cm, I don't have a measuring tape so my ruler is all I can go by, the length is slightly more than 60cm. Would this be appropriate?
I apologize for all the questions. I'd done a lot of research and assumed my aquarium would be all right for a small school of bronze corydoras but I'm not entirely sure now.