Filter Related Question - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 13 Old 12-03-2006, 04:36 AM Thread Starter
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Filter Related Question

Should the filter be completely submerged so you only see rippling or should it be above water so the tank is comstantly filled with tiny bubbles?

Any Thoughts?

Also how many fush do you think I could keep in a 48 litre tank as i am unsure?
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post #2 of 13 Old 12-03-2006, 05:05 AM
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Hi and welcome aboard, Steve.

Filters should be submerged. They aren't build to be exposed above water level otherwise they would only get damaged. Bubbles do not produce oxygen so they aren't really necessary. It is the surface movement that produce oxygen and dissipating the CO2.

As for the fish, 48 liters is equal to 14 gallons. 8 Cherry barbs may be fine in your tank otherwise you can try Tanganyikan shell dwellers. What are your water parameters?:) Determining them would make it easy for us to recommend certain species of fish for you.:) Some fish just don't get acclimated to specific water conditions.

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post #3 of 13 Old 12-04-2006, 01:11 PM Thread Starter
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My ammonia is 0, the PH is 7.2, the nitrate is around 10, and the nitrite is about 1.5.
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post #4 of 13 Old 12-04-2006, 01:55 PM
What model filter do you have?
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post #5 of 13 Old 12-04-2006, 02:36 PM
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I'm with eddie on this one... submerged or not will depend on the kind of filter you're dealing with. Some are made for submersing and others are not. If you can give us a make/model then we can give you accurate advice.

Dawn Moneyhan
Aquatics Specialist/Nutritionist
Juneau, WI
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post #6 of 13 Old 12-04-2006, 04:10 PM
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The filter type will make a difference. Tell us the model type and we can help. FWIW, I have AC HOB and I don't worry about the water levels. I fill it to the point where there is no fall from the filter on a water change and then let it evaporate until the next water change.

The nitrates are a much bigger issue. How long has the tank been set up? It may still need to cycle in which case tetras and other delicate fish may not live long.
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post #7 of 13 Old 12-04-2006, 08:31 PM
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Just a note about evaporation... I'm sure you already know this fish_4_all, but maybe others don't yet....
Water evaporates but fish waste does not. When doing a water exchange and dealing with evaporation, please don't just fill the tank back up. Always be sure to remove water before adding any, otherwise the waste levels concentrate and what isn't a problem can quickly become one. If there is a heavy waste load already, this can be quite toxic. Rule of thumb is to always remove some old water before adding any new.

Dawn Moneyhan
Aquatics Specialist/Nutritionist
Juneau, WI
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post #8 of 13 Old 12-04-2006, 11:43 PM
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Yah, I didn't make that too clear. Is a mistake I used to make in the far past and before I knew better. Topping off only dilutes what is in there and eventually leads to catastrophic failure.

I have enver seen much of an effect on CO2 levels with a small waterfall from my HOB filters. I have seen fish come and play in the bubbles but it really isn't a big deal either way.
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post #9 of 13 Old 12-05-2006, 01:12 AM
Also to add, minerals contained in water, do not evaporate either, So by adding water only as the water evaporates, builds up an excess in minerals. Unless you have a well planted tank, the buildup of minerals could potentially be harmful to the fish.
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post #10 of 13 Old 12-05-2006, 10:05 PM
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Hmm, I'm a tad confused. When you guys say "The filter should be submurged", do you mean by "filter" the bit where the water re-enters the tank after being filtered? If so in my tank after the water comes out there is a slight drop as the water returns to the tank (if this makes sense).

Is this ok? Sorry to sound silly.

Aquarium owner since November 2006
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