I don’t believe it would be safe for propane. In Alan’s studio, they
use natural gas, and I’m not sure it’s “aquarium hose” - looked more
like latex or lab tubing to me, when I was there as a student several
years ago.
In any case, you need to use hose approved for propane, if you are
using that fuel. It can rot other types of hose. Tinman Tech does
sell a lightweight hose set for the Meco midget that is good for
propane use. However, I have the standard Meco hose, and haven’t
found the hoses to be unwieldy at all.
Regards,
Bob