You do not need a ground when using GFCI receptacles. A GFCI device works by in-ballances on the neutral (ie you and water). Infact your only option is to change your 2 prong receptacles with GFCI ones if you are needing that third ground prong. To keep the recptacles code complaint. If you change a receptacle with out a ground it needs to be a GFCI or the 2 prong type on a ungrounded system. Sounds like you have alot of equipment to hook up can you get a fresh circuit or two to that location?
Also keep in mind even if you run new circuits with a new wire with a ground your electrical service is a ungrounded service. So the ground wire is serving no purpose I would try to keep you tank equiupment on a sep fuse if you can.
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