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My Tank Thread
Pretty sure this this is just a herbie
I don't believe so. My understanding is that a Herbie is a valved siphon with an emergency overflow pipe. The 1500 Glass-Holes is a small baffled overflow with two 1 1/2 drains....no valve, no emergency overflow. no siphon. The elbows have a "breather" tube just outside the bulkhead.