Jelly fish are cool! Maybe a rock or submerged boat beam for mystery?
In my real aquarium I have several plants that do not move even in strong current- so wouldnt be any animation to speak of. But your app is nice just as it is.
My tank has snails, skunk loaches, ghost shrimp, red tail sharks, two types tetras, angel fish, glow fish, koolie loach, sucker fish, moss, sword grass, dwarf angel hair grass, mint charlie, duck weed, floating lichen ferns, drift wood and a root tangle. The ghost shrimp are wicked cuz they will hunt in packs and kill and eat slow or dumb fish.
I have two types of light, co2 device, bubbler, power filter, and heater.
When I get stressed I will just sit and watch the world in the glass and let the stress go… I could see you app being the same way. Helping to relax and destress.
BTW I saw your boat and water effects video very nice.
JB