Do you guy's hate Undergravel Filters for Saltwater aquariums?

Hi, Getting some conflicting things said about undergravel filters. Here's my setup and anyone thats tried it please post postive and negitive aspects of what im about to do. This will be a 20gallon Saltwater Fish and 10 pounds of Fiji Liverock cured twice (no livesand) only aquarium. Dead Coral decoration 6inches by 6 inches. Dead Coral Sand Marine Substrate (this is more corase than sand, not sure why they call it sand) Instant ocean sea salt. 100 wat heater and regular tank Fluorescent hood. Undergravel filter with 2 reverse Venturi powerheads 270gph each with flow control. A hang off the back powerfilter (400gph Skilter) with built in protien skimmer w/ 2 carbon filter carts and added room to add carbon / zeolite bags and additional bactiral growth medium. And ive set up the Skilter filter and the output of water can somewhat be adjusted. I plan on putting in 2 or 3 tankraised clowns and a gobie, maby a cleaning shrip. (After 2 or 3 months) Thanks for the tips As you can see the items I have purchased are maby 2 to 3x's the amount I need for a 20gallon. I oversized my purchases so at a later date if im successfull with this small tank I can start a larger tank, maby a 55 gallon. Even though clearly a 55 would be much easyer on me to manage. Im hopeing I can do the 20. Ive been considering making my own trickle filter to help with the bioload. I have tons of empty 10gallons and a 2 gallon and 5 gallon tanks I can chop up into a Trickle filter. But im sort of lost on what to do. Ive viewed some DIY Trickles on the internet but they really did not show step by step instructions that I could understand. Call me dumb but does anyone know a easy inexpensive way to make a trickle filter? Like I said I got the tanks. Im not sure what kind of pump and tubing I would need. I can get a sump pump cheap but not sure if thats the kind I would need. And the bio material and plasic drip plates I can get cheap. Im working with glass cept for 5g plasti Hi, No gravity feed. Was planning on making a overflow box. I made a new question about this on here under Home Depot Wet/Dry Thanks for helping out. Im leaving this open a bit long for my initail question also. Thanks again

Asked By: Cammy - 4/13/2007
Best Answer - Chosen by Asker
I answered one of your previous questions today and brought up the undergravel filter there... More
Answered By: copperhead - 4/14/2007
Additional Answers (3)
Your setup sounds alright... More
Answered By: Chris C - 4/14/2007
Your set up sounds ok. I do run an undergravel in one of my 30 gallon salt tanks but not on the larger ones. Honestly I like the UG's on smaller tanks when run in tandem with another filter. I have never had a problem with sand or crushed coral blocking the plates or getting sucked into the tubes and spit back out... More
Answered By: danielle Z - 4/14/2007
Absolutely massive overkill in my honest opinion. don't bother with additional bio filtration given the amount of rock, protein skimmer etc... carbon etc... you will have fantastic water quality. Nothing wrong with reverse flow for marine tanks.
Answered By: wassap - 4/18/2007
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