My 150 gallon has an eheim 2250 canister filter as main filter. I also have 2 sponge filters . Yestderday i washed all the media in tank water it took me about an hour to clean my tank i had the ceramic rings in a pail of tank water for about an hour. Should i be expecting ammonia spike? Or should there he no problem? Its really hard yo clean canister filters 
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