Upon seeing the pretty little animal houses that seem to be popular, I thought I would try and make one myself. However, when I went to my game and tried, I discovered that I don't have any opaque tank walls. Well, I do, but when I place them, they are clear. Maybe I'm attempting to go about doing this wrong. The acrylic walls are like normal glass walls, it's just the opaque ones..they aren't concrete looking, just clear. I've been looking around for two days on this subject, trying to find a similar problem or topic like it. I was hoping someone could maybe point me in the right direction as to why this would occur or how I could fix it. Thank you in advance.