How about a wobble tee sprinkler, they run really well from a tank.
Wobble-Tee
and maybe a battery powered timer to turn it off and on.
Toro 53746 The Company Drip Battery Operated Hose End Timer | eBay
The other question I have is did you leave the lid loose so that air could get in the top of the tank?
Regards,
Tote
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