There is a community here "deepsea" already, which might be better for that type of content specifically though.
I assume it's this? (FWIW, as a new Lemmy user figuring stuff out, I just clicked on the link for this sub to get the URL, and then replaced uwphotography in the url bar with deepsea.)
Yep, thanks! I'm using Jerboa (android client), and I'm still figuring the simple things out.