Honestly since it's just fish, I think the Current USA Sat+ LED fixture would work very well. You can program it to create thunderstorm-like effects, true dusk/dawn effects with the high orange and red LEDs fading into blues. Blues at night. All with one fixture. I've seen this one in the past rigged up to do thunderstorms and I'm still in awe. I'd love to get one for my low light 10gal for the cool effects.
Here's a product video from currentusa
Here's a product video from currentusa
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