Would two stingrays still be good for a non-CO2 (no excel either) tank set up like a "Tom Barr low light no CO2" method, with infrequent (weekly?) fertilizing? Is this too much light?
Looks like it will be the right PAR range for two spread apart by several inches, a couple inches above tank rim for about 18" depth to substrate surface, for my non-CO2 low-tech set up! And CO2/Excel could only make it better in the future.
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