För de som kanske inte såg infon om akvariet, det står ju i beskrivningen till klippet:
Simplified fish tank. Water pump, suction pump, air pump and all accessories are concealed within tank to reduce mass. Changing of water for the top tank is not required.
Massive cleaning is reduced as cleaning is made simple. Submersible bilogical filter helps to maintain clear water. Air in top tank is to create water current.
Partial change of water, removing of unwanted particles, if required, is carried out in the bottom tank - that includes feeding.
Opening outlet at bottom of toptank allows fish to move from top to bottom without restriction. Waterfall in lower tank provides extra oxygenation.
(Var tvungen att rätta den hemska engelskan..)
Men det stämmer ju att han inte skriver HUR han gör dessa partiella vattenbyten.