Interesting. I just three days ago took out the glass from my lid that was under the light. Therefore opening a large portion of my lid. I've noticed no change in readings from my ph probe/controller. I don't watch my flowrwte or bps as the controller does that for me. And I prefer it to run heavy enough that it cycles off so that I get viewing time with the tank clear as I run a inline diffuser as well on a canister filter. I do have a dropchecker in the tank as a reference and have not noticed any change in it either.
45g fluval bowfront tank, plant 2.0 light, 2 x 206 canister filters, 5lb co2 art pro se
10g quarantine tank
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