dmolavi
Aquarium Advice Addict
I've seen a few posts around on other fora that "sealing" the top of a SW tank is not recommended, as it can cause the pH to swing. I have a glass top on my large FW tank and the pH is rock solid with no deviation. Are SW tanks more susceptible to pH swings? I would think that the glass top would help limit evaporation, which for my 20G setup, should be kept to a minimum...