That's a nice trick for bending tube!
I am using SOLID wire in this setup but you know that gives me an idea than perhaps using tube instead might work well. Then you could drip water in the top of the pipe and it would run to the bottom for sure.
To answer your question,, i was a little concerned with that myself so I took a bamboo skewer like you use on the grill and poked a few holes down through the alum on the outer edge of the can. I don't really think it was necessary in hind sight. Once these cells start growing they will form little channels that he water will distribute though but I did want to try and make sure I had the initial watering distributed. It will take awhile I think for these cells to dry and grow.
Here is the finished picture that I could not post before:
finishedCells.jpg
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