My tank is open on top and the power heads point slightly upward to agitate the surface. I've never been able to figure out why my ph won't go any higher than 8.1 and without kalk over night wants to go as low as almost 7.6. I ran tubing to the outside and have tried windows open, but its very hot in miami so not really an option. Have re-calibrated neptune ph probe a few times and also have a salifert ph test that reads slightly higher than the probe. Maybe i should try a larger skimmer and run it more dry to minimize too much skimming. I could upgrade to a reef octopus 152 or 202? any thoughts?I would do the larger skimmer - but then again - you dont really have a nutrient problem - and your pH is basically not bad. Do you have good flow in your tank (across the surface) - that might be a way to go as well as trying to provide fresh air to the room in which your tank is
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