Smart move. Honestly unless you have a massive fuge producing tons of pods it's going to be a challenge keeping one mandarin alive in a 30 gallon, 2 would be next to impossible. I had one in my 125 gallon and didn't even consider 2 (which I now have)until I upgraded to my 225. I think a lot of times people underestimate how much these guys actually eat because they can wither away so slowly.
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