If possible get T5s instead of T8s. T5s throw more light (greater lumens per watt) than T8s. What wattage do you plan to use?
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.