Just put the tank there and don't worry about it.
You've got more then enough structure there to hold everything you'd plan on putting there. Based on the picture the TGI there in your picture are only 6ft long to begin with and are resting each end on beams and there doesn't appear to be any load being transferred down from above. So you've got a load bearing wall, 2 TGI that both are being transfered onto load points through the beams that will be taking the weight. Sure the load bearing wall and the 2nd TGI that aren't directly under the tank but they will still be transferring weight as well due to the plywood and flooring further spreading the load out.
People build 2x4 stands to support their tank with less structure then what you'll have your tanks stand transferring down onto.
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