ideas?

Hey guys. Im tired of My 20 gallon, so Im setting up a new 40 gallon lagoon tank. It will be 75x75x30 cm (150 Liter). Im thinking of an Island with mangroves in the middle. What cool with could i stock this with, chromies would be cool. Had some in a previous tank and They did Good for months...

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...