yes stella is right about dechlorinators down her in christchurch we dont have chlorine in our water despite what some pet shops will tell u . remeber to place ur tank away from heat sources in your house(eg windows , fireplace or heater). natives biggest enenmy is heat . i have shrimps in with my goldfish so they should be fine in there as long as there are plenty of places to hide (think piles of 3-6cm rocks in the corners and some bog wood with sand (riversand availible at oderings $6 a huge bag) in the middle. i would go with a 2ft single tube, (u mite be able to pick up a cheap 1 on tradme) this will give u bright enuff light for veiwing but also leave some dark patches in case they are shy of the light , ane more light and i think u would never see the livestock as it would be hiding all the time! shrimps can be found in most streams and rivers around here use a net and scoop it thru the oxy weed as for koura im not sure where to find them