Maybe this will help you for my smaller crocodiles tanks 4 by 6 – 4 by 8 feet I only use fluval 403 or equivalent canister filters, the important thing is to have a depression in the bottom of the tank 12in by 12in with a 2in valve. This way all the faeces fall at the bottom and are flushed as you open the vale when needed, and all you ever use is a gallon or tow, the filter keeps everything sparkle and makes sure water circulation brings detritus at the bottom.
Regards
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Herpetoculture isn’t an exact science!!
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