I have a couple of sand sifting starfish in there that keep everything looking new.
What you have grown in 9 months will take me 2 years to grow lol. The tank looks absolutely beautiful and the fish are amazing. Ever since I started my new 300 gallon I am still trying to find that sweet spot that I had in my previous 156 gallon. Keep up the good work man, it all looks sweet. Also one question, How do you keep your sand so clean?