Hello,
this isn't a gameplay question and I am probably in the minority with this, but I think they should consider changing the aquatic symbol. I don't know why the symbol is Poseidon's trident. I understand that he is the god of the sea so the idea is obviously present, but that makes it look like all aquatic creatures in the game swear allegiance to Poseidon, which is obviously not the case since any god can recruit any creature. Also, Zeus is the god of the sky, yet all the flying creatures have a wings symbol rather than a lightning bolt symbol. Personally I would prefer a more neutral symbol for aquatic units, such as a drop or waves.
What do you guys think?