i live in cairns aswell mate, my babies are about one month old now, they live outside in the ground, i have prepared soil before i transplanted them in, i find this time of year to plant them better because of the wet season, our tap water is shit and nearly kills our babies so if u use tap water boil it and let it cool before you water ya babies or do wat i do put them outside rain will water them thruout the season, i catch rain water to water my plants when its not raining, if i run out i go to mount franklin bottled water or just boil ya tap water for 5 mins on stove, if boiling ya water put in the tiniest bit of fertilizer to make up for some of the good nutrients you have boiled out of the water with all the bad shit