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It's going to wear out your fingers, but get the appropriate allen bit and find a wrench that will fit it, then place the bit inside the screw and turn it with the wrench. Those bolts have loc-tite on them from the factory, so they'll be a booger to get out, but they will come out. Just be careful not to slip and scratch up the underside of your tank.
you can get to them with a allen wrench. but i took a bunch of painters tape and put in the area of the bolts on the tank so that you don't slip and scrastch the **** out of your tank.take your time you will be fine