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Originally Posted by reeferaddict
SamW You have a gorgeous tank and I assume that your surface isn't always like that...  I will ask what the difference is in DO between scummy and clean... notice any difference?
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Thanks. I don't aerate my tank through chopping up the surface of my reef tank. Therefore, the surface scum does not interfere significantly with the aeration in my system. In my system, the aeration is accomplished using an open loop protein skimmer (Currently AquaC Urchin). In the past, before I used this type of skimmer, I had to aerate with a venturi from the Millenium HOB filter. I just measured the DO level in my tank just now with one 150W MH Bulb on and it is 89%. This is the normal level in my tank w/ 1 bulb on at night (w/ no other ambient light). When both lights are on, the DO levels go to about 110%. Without any photosynthesis (lights off), the AquaC Urchin maintains a DO level of 85%. This is an improvement over the venturi which maintained a DO level of 55% with lights off and an improvement over my previous closed loop skimmer which could not maintain a DO level above 35% (probably closer to 20-25%. Didn't wait to find out. I had to turn the venturi back on to avoid killing stuff during this test).