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Old 02-27-2005, 10:04 PM   #1
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drawbacks to undergravel filters and small amounts of gravel

well about a week ago while at a friends house i was looking at his tank and he has a thin layer of gravel with a non running undergravel filter. well i decided to look and see how much fish poop was under his tank so i looked under the stand and saw something swimming around under the filter, well it turns out that his last batch of convict fry(all babies died) had two strays that decided to burrow, the only two survivors of the last batch of fry were living off fish poop under the filter, so we took the tank all apart to get to them and saved them. we decided against putting the undergravel filter plates back in so as not to have any more baby fish episodes. so if you decide to have an undergravel filter, and your fish breed DO NOT have a thin layer of gravel.
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Old 03-01-2005, 07:06 AM   #2
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Even a thick layer of gravel will eventually do the same thing. It just takes longer to get all gunky like that. I am not a fan of UGFs at all. I say...avoid them at all costs. That gunk can not only progress disease and parasitic infestations...it can produce disease causing bacteria and allow wounds to grow fungus. A dinkly air pump driven internal corner filter with floss and carbon makes a better filter!! No kidding!!
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Old 03-01-2005, 12:26 PM   #3
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yep i had one i removed a long time ago. all it did was hold green water underneath it.
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Old 03-01-2005, 12:38 PM   #4
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What about having stagnant water underneath all that substrate. I have read where it's good to have airflow under there.
Just curious, and thanks for your response.
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Old 03-01-2005, 01:47 PM   #5
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If you MUST have an undergravel filter, I would recommend a "reverse flow" system hooked up to the output of a canister filter.
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Old 03-01-2005, 03:39 PM   #6
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All I use are UGF's 3 years strong and still going. If you vaccum weekly or bi weekly you have no problems. Its the person using the UGF that usually doesnt know how to take care of one. At least the UGF saved a couple fry on top of that if there was something terrible under the UGF how did those fry survive.
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Old 03-01-2005, 05:41 PM   #7
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UGF's for us have been nothing but trouble. We put it in and do everything that we're supposed to do (cleaning gravel bi-weekly, changing cartirdges like normal) and it doesn't do anything good to the tank. All it seems to do is pull stuff under it for it to just sit. I finally took the last one out of the 10 gal and it was a cruddy mess. I had to tear the entire tank down. The water was so green (under it) and full of fishy poop. I also noticed that a lot of fishy waste was being pulled into the rocks, but not all the way down. They are a waste of time and money. You're better off with a hob or canister. Technology has greatly increased since the old times of ugfs.
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Old 03-02-2005, 02:39 AM   #8
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When vaccuming a UGF you have to go all the way to the bottom and suck the plate too. Most HOB do not have enough BIO filtration some bio wheel filters make of for the lack of Bio flitration. Canisters can have a good amount of bio filtration with the right set up.

anyhow if theres stuff going under or gathering under your UGF you either have not enough gravel, you do not vaccum right, or you do not have enough water flow for the UGF to work correctly its as simple as that.
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Old 03-02-2005, 02:40 AM   #9
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UGF carbon cartridges are a gimmick that causes back flow they could cause problems.

Also putting anything that says clears the water when its cloudy will mess up a UGF.

another tip to UGF's is to have cone trumpet snails. they dig into the gravel and keep it turned over and help clear any wastes trapped into the gravel.

vaccum the gravel lightly and heavly vaccum 1/3-1/2 of the gravel weekly/bi weekly and switch sides the next time. move around plants rocks etc and get under them to prevent dead spots.

Some people even stick the vaccum or the tube down the up lift tube every so often and vaccum under the UGF.

UGF's work fine if you do the right things.
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Old 03-02-2005, 04:34 AM   #10
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I don't like UGF's because i find that plants do better without them generally. HOWEVER, before I tried growing so many plants I used UGF's for years with none of the above mentioned trouble. Occasionally, I'd pull down the tank to get and gunk out, leaving the gravel damp of course. But this was usually when I changed the theme of the tank and got all new inhabitants.

Mr. Guppyman is correct. If you clean well the gunk is kept to a minimum.

They are also very handy and economical for large numbers of small tanks (<20gal),
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