the fantastic total
__
extremely good and theacӔ1uiSition of bacteria can be that much
faster than in a natural system.
to populate a-newbed‘
‘
srmply by putting a piece ofmzeat ôr fish into the aquarium and —»
allowmg it to rot, but‘th—is process would probablytake longer than
the ‘turtle’ method as the
would notbe in such a convenient
form for
assimilation as would the faeces from a turtle or a
large sh. lf rotting meat has to be used it should be ground up for
best
'
Air in
,
_
,
,
'
…
Air/water out
//
;
,
'
%
‘°oËqo°:
.
.
700
%
ll
_,,
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Û°°
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,.
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-
_
\\\‘\ v
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.
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4Wlllll
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Sub-gravel filter plate
Fig. 8. The freshwater biological system. This figure shows an aquarium in Which
'
a number of young fishes are successfully being reared in a container Which would
be overpopulated if
for the biological system. No ornamental inclusions
.
or plants are present in this specialised environment
'
'
It,mustîbe-stressedÿthat_while
enawgrowmgtheenv1r®nmentmaybeœmetemP@rarrwmcfr
ment _must only be
hghtlyunt11thetemporaïytX1CStage
has passed. The level of concentration of amm0n1aproductspresent
-is measured by means of a nitrite test kit
‘
Finally, whenthe environment is at its full n1tr1fy1ngpotent1a11t
be stocked quite heavily and any
_
;£Qod. and even the odd small dead fish need not be
—
.
…
«
,
-
-
water ;I-t . must be noted that the system 15 dependent
culat1nof the water through the bed to maintain aerobic c'ondrtrori‘S‘;f,
andthuscontmurty of the air supply to the sub-gravel lter 1sV‘1‘tal. ;—
Thesupplyshould'
not be sWitched off nor lost through breakdowf ;
___
…________…