I have the same fixture for my tank. Has worked well...but I just posted a question about re-wiring my entire fixture, as I have one "socket" that doesn't work. Sounds like we have similar problems. I am almost 100% sure that my problem with the 4th bulb not turning on is due to the bad wires (they are super brittle). Two of the other three bulbs of mine only turn on when the 1st bulb has been running for a bit, heating them up...probably drying out the moisture (even though there's a cover). I live in downtown Vancouver, if you wanted to bring your fixture here and we could use the bulbs I have now in it to see...that way you don't have to buy any yet, and I don't have to give any away yet. Just an idea. Look for my post in the DIY section too...maybe yours is just a re-wiring problem too. And in the event you are looking to get rid of it...I might be interested in buying it off of you, and doing the re-wiring myself.
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