Got an idea:
- Leave them as it is (older content that shouldn't not be moved behind aquatics)
- You own aquatis: Give them an option to be toggled as aquatics (? something similar? Like optional aquatics for them) When picking them. A quick mod could do that too I suppose, though not the goal here.
I clearly understand the question at hand here. Some species that we have are clearly aquatic in some manners, inspiration, by design, etc. So having the option would be nice. But one could agree that those (the one we already have), when just stopping and looking at them, you can clearly immagine/see a species that can be amphibious or even totally terrestrial after moving from the waters. They don't necessarily feel like "obligatory aquatic beings" when you look at them, I guess that's what I mean.
That's probably a reason why it's quite likely they'll be just left as they are.
When I look at it from this angle, Aquatics NEED to be aquatic, in a sense, by design, and the older ones not necessarily at all, that's why I'm okay with it if it just stays as it is.