Hey all, I've got 4 100 gal round alu fuel tanks off a big rig offered to me for a song. And I can't sing, that's how cheap they are. Anyway, anyone with opinions on using these as open storage? Figure I'm allowed to just braze on copper fittings to tie them together. The rest of the system right now is just iron pipe at the near boiler loop to pex-al-pex looping over to a heat coil in the plenum of the forced air system. But I have a bunch of steel panel radiators I'd like to incorporate some day too. Thoughts? I never seem to see aluminum tanks being used. Is it thought to be a no-no to put aluminum anywhere in the system for galvanic reasons?