This rather large aquarium belonging to Krzystof Tyk of Warsaw, Poland, contains such delicate organisms (which are not really
suitable for the novice) that the necessary water treatment would be very difficult to accommodate in the main tank. In this case, a
separate filter tank makes considerable sense.
turn pump and waiting. The eventual maximum level in
the sump should be noticeably below the top rim of the
tank. When you then switch the pump back on, the water level in the sump should continue to drop until that
in the main tank has risen sufficiently for water to once
again flow down the down-pipe. The water level in the
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filter tank should then be permanently set at this height,
which will thereafter be your “maximum-fill” level. If
possible, you should mark this with a clearly visible line,
so that it is never exceeded.
Finally, for small to medium aquariums, a hang-on-the-back acrylic sump may be perfect compromise.