I choose Logo 1 for its neatness and coolness.
It will be even better if the green text can be changed to navy blue (down wards toning).

Logo 4 is special too. It didn't get my pick because i would prefer aquatic plant to be featured instead of fish.

Logo 5 is original. It would be much better if the glosso like plant is moved to the top/back of MAC. And the glosso like plant to be replaced by a bolbitis/moss like plant.

Just my 2 cents. Great effort, guy !!!

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There is another world in the waters........

Littar Tan