Now, you may be like "HERP DERP STUPID SUGGESTION PLS LOCK" but please read on. This whole suggestion is based off one problem in 1.9: Chorus Fruit. In order to stop any chorus fruit, you need to make a wall at LEAST 8 blocks thick. That means you need 200 obsidian to cover the area the size of a Cubelet opener. I'll post a video later, but it is still uploading. Let me know what you think!