first of all, I think you need more members to run a good POTM...
in my personal opinion and no offense to you personally, but there are just way to many forums on the net that have to care of tropical fish, with that being said you might have a hard time driving in traffic to your site unless you can offer something on your site that stands out from the rest...
APF (this site) stands out from the rest since it is more for photography of aquatic animal (and other stuff) and not just for keeping tropical fish...
Once angain, I dont mean to offend you or anyone else that runs a site, I am just stating my opinion...