'
«
f
»
'
,.
41
.
Changes in conditions in the environment temporarin affect the
efficiency of a biological system butthe system usually recovers and
carries on-as
temperature, fishpopulation and so on
'
all produce temporary changes. Changes in the specific gravity of salt
water due to evaporation losses shouldnot be allowed to exceed
0.002 before adding fresh water, otherwise' the bacteria
be
'
affected.
,
‘
‘
.
The efficiency of this kind of system and its state at any particular
time can be tested by measuring the nitrite content of the waterwith ' ’
simple
p. 189). A reading which indicates a very low
,
content or none at all indicates that the environment is ‘clean’ and
that the nitrogen cycle is being completed.
"
Other filters may be used in_conjunction with a biological system
but their use is encoutaged only when absolutely necessary. For '_
example,
a very dirty situation where the condition islikely to “be
permanent, a mechanical filter may alleviate clogging of the
logical system. Also, if any activated charcoal filtration is required it
.
can be carried out in the mechanical filter, thereby having no effect
on the bacteria in the bed. Neglected mechanical and carbon filters
take on a biological characteristic if left long enough without
ing, as “a result of the eventual population of "their surfaces by '
«
'
nitrifying bacteria,but the available areas are not usually large enough
”f
to
“significantly to. the nitrifÿing potential of the environment.
Thé biological system :is probably the best overall method f0r
general use. Its large nitrifying potential allows the aquarist more
'
_
to concentrate on his fishes
there is no need for constant…surveil-‘
lance and removal of waste, eäccept in very extreme cases. The—Ÿ system
f
_
is adaptableto ‘allkinds of dnvironments, isparticularly
f
and iseasy to understand and to use.Marine fiShkeepinghas definite-Ç’”*
ly benefited. fromthis system as its use had' done awaywith much of
“
the mystique formerly associated with this. branch of
serious development is in fact probably a result of the needto ;
-
simplify the
complicated methods
marine ;.fiS‘h—‘
-i
_
.
-
…
'
,
The biological system is, however, usatisfactory in environmets
Where alush
required. The plants do
able to. t‘olerate thé
of Water around their roQÿts and1tl$
that
"
süCh highly aerobic 'Ïc‘onditions may {be toor1chfor
them It-caïn … also be argu__çd th—atplant—s which
from & deficiency of_essentialsalts;thn thÇ nitrifying…
—
—
action is goodIn ;C,a$es Where
with :subégraveléf.iltrati‘on
jf ‘
«
f
»
'
,.
41
.
Changes in conditions in the environment temporarin affect the
efficiency of a biological system butthe system usually recovers and
carries on-as
temperature, fishpopulation and so on
'
all produce temporary changes. Changes in the specific gravity of salt
water due to evaporation losses shouldnot be allowed to exceed
0.002 before adding fresh water, otherwise' the bacteria
be
'
affected.
,
‘
‘
.
The efficiency of this kind of system and its state at any particular
time can be tested by measuring the nitrite content of the waterwith ' ’
simple
p. 189). A reading which indicates a very low
,
content or none at all indicates that the environment is ‘clean’ and
that the nitrogen cycle is being completed.
"
Other filters may be used in_conjunction with a biological system
but their use is encoutaged only when absolutely necessary. For '_
example,
a very dirty situation where the condition islikely to “be
permanent, a mechanical filter may alleviate clogging of the
logical system. Also, if any activated charcoal filtration is required it
.
can be carried out in the mechanical filter, thereby having no effect
on the bacteria in the bed. Neglected mechanical and carbon filters
take on a biological characteristic if left long enough without
ing, as “a result of the eventual population of "their surfaces by '
«
'
nitrifying bacteria,but the available areas are not usually large enough
”f
to
“significantly to. the nitrifÿing potential of the environment.
Thé biological system :is probably the best overall method f0r
general use. Its large nitrifying potential allows the aquarist more
'
_
to concentrate on his fishes
there is no need for constant…surveil-‘
lance and removal of waste, eäccept in very extreme cases. The—Ÿ system
f
_
is adaptableto ‘allkinds of dnvironments, isparticularly
f
and iseasy to understand and to use.Marine fiShkeepinghas definite-Ç’”*
ly benefited. fromthis system as its use had' done awaywith much of
“
the mystique formerly associated with this. branch of
serious development is in fact probably a result of the needto ;
-
simplify the
complicated methods
marine ;.fiS‘h—‘
-i
_
.
-
…
'
,
The biological system is, however, usatisfactory in environmets
Where alush
required. The plants do
able to. t‘olerate thé
of Water around their roQÿts and1tl$
that
"
süCh highly aerobic 'Ïc‘onditions may {be toor1chfor
them It-caïn … also be argu__çd th—atplant—s which
from & deficiency of_essentialsalts;thn thÇ nitrifying…
—
—
action is goodIn ;C,a$es Where
with :subégraveléf.iltrati‘on
jf ‘