I would have to say I think the smallest tank for a pair would be a 20 gallon either high or long . I have found from my experience that longer tanks work better. Seahorses seem to be more active in a longer tank or larger tank. For quite some time we had a Seahorse tank at the shop and we used a 75 gallon, the horses were very active swimming all over the tank and I thought their feeding response was better.
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