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why does my fish tank water go green arfter ichange it arfter 2 days2007-11-24 23:43:58

1. Do you you have a light in your tank, check what type of a light it is. It may be one of those photo(something or other) lights. They promote plant growth and could be causing the algae to grow.

or

2. Is your tank in direct sunlight. The sun promotes the growth of the algae.

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Tank in sunlight promotes algae. Also if you feed the fish too much then that can cause it too.

Buy a Stone Loach, they feed on it so are great. Just be careful to feed then algae tablets until it builds up naturally.

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Sunlight?

Did you clean the filter?

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You are using the wrong fish food after you clean the tank.

Wait several hours, have a party, get drunk - hey presto crisp crumbs and vodka and coke left overs so your fish can join in the party too!

Works a treat if you can place the tank on top of the speakers - Watch em dance baby!

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This is Algae bloom. Never change all the water and you should try some live plants in your tank. It will help balance the healthy bacteria. There are chemicals to adjust healthy bacteria quickly. Try covering the tank where the sun hits, it will give some relief also.

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It's because it is hit by the sun.. and that makes the growth of algae faster..

you should give it a roof to cover the sun's heat..

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I noticed that everyone was saying light. I disagree. Light can be one source of algae growth. Since it is happening 2 days AFTER you change your water I suspect it is one of two things. 1. You are changing too much water at once and your tank is stabilizing itself by the algae bloom. Or 2. You are cleaning your tank too much and again it is stabilizing itself.