I have lots of experience as a woodworker. Any of the wood species you listed will work fine - Oak looks nicer, but pine costs less and is strong. Look for "S4S" beams. This means they have been "Sanded on four sides". They cost a bit more but save a lot of time sanding! Keep in mind the following points:
(1) Wood has a very high compression strength along the vertical grain. The fact that trees can grow to hundreds of feet in height proves this out. Any of the woods you listed, even the pine, will support your tank with no troubles.
(2) It is not so much the wood species you select as it is the grain characteristics that are of major importance. You want straight grain in whatever wood you choose. Also, check each peice you select for bowing and cupping (curving along both the width and edge). You want each beam to be straight as an arrow.
(3) Method of construction far outweighs choice of wood. You want all the weight bearing aspects of the tank to be transfered to the vertical supports in an efficient manner. For example: have the horizontal top members resting on top of the vertical supports - not attached to the side of the verticals with metal brackets. This will help distribute weight all along the length of the tank to the verticals.
(4) Use wood glue in combination with wood screws. If you use just the screws, this will not add much strength to the structure. Wood glue, if used right, is far stronger than screws.
(5) Get yourself a large triangle or 90 degree square. Use this as you join wooden members to make sure all your angles are at 90 degrees to one another.
Hope this helps.....