exturnal filter

  1. Nathanh2150

    Can anyone help

    Hi everyone I have just purchased an evolution aqua aquascaper 900 I currently have an oase biomaster 250 Thermo I understand the tank holds upto 186ltrs of water and the extunal filter filters 250ltrs is this do able on my new aquarium or do I need to upgrade ? All the help would be much...
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