See the first win

Overall risk: Low. The closest references are aimed at open water and pontoon-scale systems, and none pairs a closed rainwater tank with daylight-matched circulation.

Claim spaces in the closest art

• Floating solar arrays that power water-quality gear [1]

  Claims a floating photovoltaic array whose energy runs aerators, diffusers and subsurface circulators on large open water bodies. The closest space to yours.

• Dedicated solar aeration and circulation devices [2], [3], [4], [8]

  Claim solar-powered pumps, diffusers, and bubble- or motion-driven circulation for ponds and reservoirs, generally shore-powered or pond-scale.

• General circulation and oxygenation apparatus [16], [19]

  Claim moving or oxygenating stored water without a solar or floating element.

Where your configuration sits

Your specific combination, a small self-contained float sized so its own panel keeps a closed rainwater store fresh by matching circulation to the daylight that drives the algae, does not appear in the claims of the references found. The floating-solar art [1] is aimed at large open water bodies and pontoon or grid systems; the aeration art [2] to [4] does not tie circulation to daylight as the operative mechanism.

Design-around angles

• Frame claims around the self-contained, rainwater-tank-specific float and the daylight-matched operation rather than "solar aeration" broadly, to stay clear of [1] to [4].
• Leave pontoon-scale floating arrays and grid interconnection out of the claims; that is [1]'s space.
• If you add a battery for overnight running, keep it as a dependent feature so the independent claim still reads on the direct, daylight-driven configuration.

A title-and-abstract-level read across worldwide patents, with a close read of [1], [2] and [8] recommended before you sell.

This is a non-legal analyst memo, not legal advice. An IP attorney will use this kind of memo as a starting point.