I have a 52ltr fish tank,it smells awful?

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used gravel pump,1/2changed water have real plants x4[not decaying],filter fluval2 clean,glass clean wot next? please & don't say bleach

 

[josephcrome321]

soak your tank in mild detergent then rinse thoroughly

 

[Emery]

get fish tank cleaners and thoroughly clean it.then if that dosent work buy another one.