One other problem I've noticed with my modification is with using a surge device. If the water level rises too rapidly and submerges the air hole, performance degrades. My overflow is built-in and has a cover plate. I will need to use a longer "spacer" so that the air hole will be above the highest possible water level.
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Looking for perfection in an imperfect world.
Until one has loved an animal, a part of one's soul remains unawakened.
~ Anatole France (1844-1924)
Current Tank Info: Dusty 110g, 55g & 29g tanks
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