The boards are not supporting the full tank. They are covering most of the span of bottom glass, but that is up to you. Honestly, you have a beautiful home from the pictures I saw, and your low-budget setup doesn't match up.
Why are you using a HOB filter on the refugium?
The anemone looks like a Seabae to me, although the images aren't clear enough to be positive. Sorry about that, it is just a guess at this point.
There is something called alleopathy, a type of chemical warfare that occurs between anemones in a single system. It is better to pick one that you want rather than to have many different ones. With chemicals, they literally kill another one on the opposite end of the tank. Please do more research on that, in case that is what is occurring your tank.
It could be a water quality issue, or even a lighting issue. What lights did you put over this tank?
Cured LR is expensive. Do you have more than one LFS in your area? Or perhaps there are hobbyists or a club that you can visit with. Oftentimes there are people either downgrading or leaving the hobby that sell their LR for $2 to $4 per pound.