I may of got hear to late to help but I have, am currently using one and works awsome. Standard bulb this one9 Watt Germicidal UV Bulb G23 Base 9W JEBAO SUNSUN JEBO - eBay (item 360208652160 end time Jan-15-10 15:10:08 PST)EDIT: Can anyone give ME a reason not to buy this? Seems like a solid deal to me =/
I've got the GKM 9w in my 46, that i set to run at night. I removed the default sponge filter, and cut a 4x larger filter out of an aquaclear sponge I had laying around. ( By increasing the surface area, the sponge needs to be cleaned less often, and it's a cinch to cut one to size (as well as extremely inexpensive).My only comment is that the little sponge that filters the intake gunks up kinda fast,
I have 2 and they work great.I second the Green Killing Machine @ Petsmart. 9W version is $39.99 and advertises "up to 53 gallons."
My only comment is that the little sponge that filters the intake gunks up kinda fast, so it would need a quick rinse about every week or so. 10 seconds of shaking in a water change bucket while siphoning did the trick.