I was at Hobby Lobby the other day and saw these colored glass bottles and thought that these could make an interesting display in the reef and not to mention a perfect little home for a blenny or goby. Though I'd share some pics.
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LOL.!!.....Im attracted to colorful things. I think It could look cool once coralline and other things start to make it a part of the habitat.
My only concern would be that the water in it may become stagnant and be a breeding place for unwanted bacteria. If I were to do that in my tank, I would probably break or cut off the bottom first to allow water to flow through. I would then back it up to the rocks and hide the broken off part. It will eventually become part of the rockscape, a nice little cave with some water ventilation.
Here's a pretty cool thread about putting bottles in your tank.
https://www.reef2reef.com/forums/do-yourself-diy/142123-put-bottle-your-tank.html

My only concern would be that the water in it may become stagnant and be a breeding place for unwanted bacteria. If I were to do that in my tank, I would probably break or cut off the bottom first to allow water to flow through. I would then back it up to the rocks and hide the broken off part. It will eventually become part of the rockscape, a nice little cave with some water ventilation.

