here is a bizaare question for you lovely lot

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Well i have just put goldfish in are troughs .. and they are fine ! also when you do clean out your troughs you do get little insect things in the bottom and fishy things .. and they all poo. but i clean the troughs out 2 twice a year and use alot of water doing this and filling the troughs up again. so this is why i thought i would try using goldfish .. and if it doesnt work then they can go and live in a pond

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Hope you realise you've made much more work for yorself by adding fish, you need to be changing about 25% of it every 2-3 weeks or the ammonia will build up to poisonous levels for the fish. Please don't leave it 6 months before you change it now there are fish in it.
 
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