Everyone seems to go on about having this super filter at millions of lph sumps, wiers, bio this and that
All keep the water crystal clear and free from anything nasty agreed





So why change water every week or so
i don't get it

Quite possibly and most likely ,,to reduce Nitrates.... Only specific filters will do that,,so the rest of us have to lug pales of water from tap to tank,,,

ok look at it like living in a house and opening the windows to freshen the place up!

its simple realy
polution is what your removing whilst doing a water change. this is in the form of fish phoo,fish Wee(amonia) and decaying rotting uneaten food.

by doing a weekly waterchange you are diluting the cr@p in the water making it nicer for your fish

you get the idea?

h2h robert

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Yeah, mainly to reduce nitrate. Gets really high in my Frontosa tank and only can be diluted with water changes. Tanganyikan Cichlids are very sensitive to high nitrates so quite big water changes need to be done weekly.

Same with the marine tank, corals cant take high nitrates and slowly die. No other effective way of lowering it.

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8' x 2' x 2' - Marine Reef.
6' x 2' x 18" - Wild Caught Zaire 'Moba' Frontosa
4' x 2' x 20" - Malawi
4' x 22" x 18" - Malawi + Victoria
4' x 18" x 18" - Breeding Cuban Cichlids.
Trigon 190 - Male Paratilapia Polleni
20" x 20" x 20" - Marine
30" x 1' x 1' - Hospital Tank
2' x 1' x 1' - Tropical

and

7x - 1' and 2' cichlid fry tanks

--> Nitrate removal,

--> Add's minerals to the water to help prevent a pH crash,

--> Reduces any small amount of pollutants that may have got into tank water (air freshener, smoke etc),

--> Can apparently help reduce hormones (that fish give off) in the water that can restrict a fish's growth.

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My Set-Up's

http://www.aquarist-classifieds.co.u...et-up-925.html

http://www.aquarist-classifieds.co.u...et-up-918.html

http://www.aquarist-classifieds.co.u...l-set-929.html

Thanks for all the replies peeps.
Still cant quite understand the need for changes as i never do mine and never have yet everything has always been fine
which is the reason i asked really

How many fish do you have, what kind of fish and how big is the tank? Is it heavily planted?

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Lucia