Your welcome!
The forum is quite large. At peak times during the day, we will have as many as 8,000+ members online. And it's getting larger. We are the largest saltwater/reefing site in the world.
Brook is a highly contagious disease and is common with clowns, but other fish can get it too.
A great read
:
https://www.reef2reef.com/threads/fish-diseases-101.189284/
One thing as a hobbyist that came from freshwater, any fish can become sick, fresh or salt. Learning what to look for can take sometime, but over time with experience is key.
I learned the hard way when I first started out, loosing $300+ of fish to Ich.
Before buying anymore fish, buy a QT set up and meds to treat them. Not to sound arrogant or pushy, just looking out for you.
Research compatibility and only buy healthy fish. Ask the LFS to see them eat first.
Let's make sure the fish you have are healthy and clear of issues before going forward.
Once again, we've all been where your at before. Heck when I started out, there wasn't any internet! Lol