I'm planning to build a 4 tub rack using melamine pretty soon and I just have a few concerns.

How much space should I leave between tubs and shelves? I've seen people use CDs as a guide. Is this a good guideline to use?

Also, it safe to thread one long piece of 4 inch flexwatt throughout the rack for belly heat? Or is it better to run multiple strips of flexwatt on one power strip recessed into the shelves.

I was thinking it would be okay to just use one strip, but would this be a fire hazard in the long run?
Which is the safest?

Any other suggestions to lookout for?

Thanks in advance.

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