You can leave the water half/fully filled up in the tank and put one fighting fish inside. As compared to feeder fish which may die, they're very hardy fishes so should have no problems with you being away for so long, just need someone to feed it once a while.
Btw won't the soil smell if it's left moist for so long especially since it's been used before and there will be fish waste in there? I remember many yrs back, i decomissioned a tank with lapis sand without clearing out the moist/wet sand due to laziness and after a few mths when i decided to clear out the sand, the sand STINKS!!![]()
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