What about a submerged light or two on that shelf? Perhaps one with a grow light bulb. Some heat, some light......it might even be pleasing to the eye.
1.3 A, 80 yr old, renovation summer 2017, SW VA, 2000' elevation, Shallow, Spring Fed, Little Watershed, Stock Fall '17 with LMB, BG, RESF, FHM. Indigenous: Triploid Grass Carp, Israeli Carp, GSH
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