If possible get T5s instead of T8s. T5s throw more light (greater lumens per watt) than T8s. What wattage do you plan to use?
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Syphoning only works if you are going from a level of high water to a lower level. I don't think syphoning from your tub to your tank will work, unless you have a very different looking tub than I am used to, or your tank is on the floor.
If you are going with a sand substrate, then just go with a plain old hose. Something like this.