I just though that if you moved the repens to a more prominent place, the darker colors might add some interesting contrast. Keep an eye on the polysperma and if it starts to yellow and gets stunted, you may need to test for nitrate. But then again, you have a fair # of fish in there.
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45 gallon, XP-3, pressurized CO2, external reactor, 3 x 30 watt fluorescent tubes (2 are 4x ODNO), 80% Flourite, Hydor heater, 1 oto, 5 harlequins, 3 "copper" rasboras, platy, 3 dwarf neon rainbows, 8 cory cats, 6 pristella tetras, betta. Rena pimp #15.
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