need a plan

Hey everyone! This is my very first saltwater tank and I’m so excited. I have always wanted one! A little background, it’s a 16gal BioCube, previously owned. My dad got it for me, since he decided to downsize his 32gal (which he still hasn’t done yet lol), and didn’t change the rock, sand, or...

I have a 140 gallon tank that has been running for about a month now(no fish or corals only 1 snail and live rock. Will be adding sand shortly) and am planning on a giant cave in the middle with live rock. I want to color coordinate the tank. I want purple-ish blue on one side and a red and blue...