Hi Rei.
Practically speaking, I humbly think a 2 gallon might be a bit too small, although some users here on canreef have small tanks. Personally speaking, I think something along the lines of a 10 gallon would be better suited for the children to enjoy.
Given the small dimensions of a 2 gallon tank, a heater would take up alot of space for enjoyable viewing, but if you get a 10 gallon tank, not only would you have room for a heater (and a filter, which helps slow the decline of water quality), you can have more fish and a more wholesome piece of nature.
Many users sell smaller tank setups here on Canreef from time to time, so I think if you were to get a heater, one of these setups would go with it much better.
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