Murray, what's this measure twice and cut once stuff, don't you watch Red Green or Tim the tool man?
Okay all joking aside, myself I've had 20 gallon tanks and 15s that extended over an edge about an inch or so with no issues but if I was going to build a breeding room again I would fully support everything.
FWIW I had some 15s and some 20s on ply with an inch or so over hang and I had some 15s and 20s on just a couple of 2x4s I had them in a typical fish store set up, side facing front/back and they all were on 3 2x4s that ran sideways so the tanks sat side facing front but the wood was running across the narrow width of the tanks. It worked with out trouble but again if I was going to build another breeding room I'd support it all properly.
Doug
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