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I expect it will arrive by friday. If you ordered it direct from the importer I always get mine in 2-3 days, so far anyway. A 50W heater sounds too powerful to most people for such a small tank, but they are what I use (also used in the 15L) on all mine, I don't think those lucky enough to live in warmer climates realise how cold it can get here (especially over night), and if you live in an old house like I do they don't hold the heat very well being brick without cavity walls etc. I once tried a 25W in a 20L and it couldn't cope............. was on constantly and soon gave up the ghost for good. I would leave some prepared zerowater in an old 1L bottle then for your mum to use to top up the tank if needed. If the water level drops to the point where it switches off automatically and it isn't then topped up the water will cool quite quickly in a small tank, but as you say, it is safe in that the heater shouldn't break. Evaporation will also depend on how good the cover is as well. Simon

i have a 50 watt heater in the tank set at 23C but the tank maintains at 24C. the heater is clever, if there isn't water around it it automatically powers off. shrimp minerals should be here today but the Zero-water Jug hasn't even reached the courier yet... still I'm hoping it will be here by Friday.

If you are going away for 2 weeks, you won't need to top up the water. Any loss to evaporation can certainly wait until you return to be topped off. Leave some takeaway plastic containers with the exact amount of food you want to feed near the tank. Label each container with the feeding date printed on the cover. So the person feeding your shrimp just needs to open the container and pour in the contents. Feeding once every 3 days should be enough.