I have learned pretty much everything i know from
Its a great website for the begginer to the advanced aquarist. The people there are very nice and will teach you a lot about saltwater aquariums.
Edit:Links to other hobby related forums are not allowed!
If you're not aware already, posting links to other sites is not permitted here. Additionally, spamming other sites is in poor taste. Doubtful there's much on the other board that you can't find here anyway.
Not only is it a violation of this sites policy to post that link it is just plain rude. We all know other sites are out there...but this one does not allow links to vendors or other hobby related sites.