Wolf-fish were present in both pools; however, no pike cichlids present in the first pool and no blue acaras in the second.
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Wolf-fish were present in both pools, however no pike cichlids were present in the first pool, and no blue acaras were present in the second.

I am not sure whether my interpretation is correct, but I would suggest you write in the positive rather than the negative for easier reading.

Wolf-fish were found in both pools, but blue acaras were only present in the first pool, while pike cichlids were only present in the second.