You don't need a skimmer for the 2.5 gallon just do water changes weekly and there should be no problem. I would not put a second fish in a tank that small. A general rule of thumb is that the smaller the tank the harder it will be to keep everything stable as the smallest offset can mess up the entire tank fast. I had one that size there fun good luck.
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Keener
Current Tank Info: 24x24x12 DIY AIO SPS tank w/2 Par 38 lights, hydor nano skimmer and reef angel.
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