tap plastic, it's cheap too. you can even bend it using a hot blow dryer if you fill the pipe with benable wire. thats so it doesn't collapse. good luck
Thanks everyone, I found what I needed at tapplastics. They do sell everything within reason. I talked to a sales rep. and he was very helpful & full of ideas.
Matt, I doubt the ancistrus would breed in clear pipe.. because it seems that the fry prefer dark areas until they get bigger. It is a good guess though, kinda like the ghost knives as they "feel" secure in there.. even though they can be seen.
Think African cichlids... that's all I have to say
clear pvc 
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