20 Year old setup, what is it worth?

[a hill]

I'm hoping to gain some insight here. Came across this and am trying to figure out a reasonable offer. System is over 10 years old. Im horrendous at taking photos of things in tanks. I edited the photo with the clowns to try and represent the colors accurately. The original is washed out. Other photos are bad as well. DT Volume is 100+ gallons. Contains a few types of frogspawn and hammer along with mushrooms and a few other odds and ends. Any ideas on what the coral types are worth would be useful also.

Again, sorry on the crappy photos.

My photos do not capture the beauty of the coral.

-Andrew