Hi I have a spare 18x9x9 aquarium and I was going to just use it for fish but how often would I need to change the water if I used an air pump???




Thanx.

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Its a bit like how long is a piece of string ,what is it to be used for? is the air pump running a filter? more details would be helpful.

regards G

really id say change the water every 2-3 weeks for tropicals

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Its just a small tank for guppies and its a Tetratec air pump.
There is no filter...what is the cheapest filter out there???

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Some kind of under gravel. I doubt you could get one that small....
Even the smallest internal would be too big for that...
Maybe a little one that attaches to your filter.

Edit: You're in luck. ALGARDE UNDERGRAVEL FILTER

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Thanx for finding the filter mate , but for the mean-time how often would the water have to be changed if I used the tetratec air pump???

This is the one I have:
http://www.swelluk.com/img/shop/orig...etra-aps50.jpg .

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weekly at least i'd say.....


Guide to Freshwater Aquarium Setup

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please do not just use an air pump after all fish produce waste and a filter brakes down the waste.....if you realy only want to use an air pump get some foam thats for a filter and pop the airstone into the middle of it this will give you some surface area for bacteria to colonise on ...but you will need to stock it very lightly as its a small tank ....or get the smallest rena or hagen filter

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A fleuval 2+ and anything below that will fit in there... i have a 2+ in my 15x8x9.

go to your lfs and get a small filter, seriously. otherwise you will have to do water changes almost everyday.

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hi you would have to change the water once a week 20% a fluval one internal would be fine for that size of tank