Welcome to AA!
In short...
This is a forum, you can ask questions, post topics, or chat with other members in the Chat Room. If you need some help or info on your fish etc. then post a new forum in the appropriate category and someone here on AA will help you out.
It's an awesome forum and the members here are kind and helpful.
Just be sure to provide enough info the next time you post so that the members can help you better.