Xref: 127.0.0.1 rec.aquaria.freshwater.plants:66029


"snark@boojum" wrote in message
...
The PH and CO2 affect the KH. If you test your tap water you will probably
find that the KH is lower than it is in your tank.

Recommendation: Lower PH and see what effect that has on the KH and FE. Go
ahead and reduce period of lighting to 11 hours and keep thermostat as low
as you can without hurting the fish.

Can anyone comment on adding Bisodium Phosphate to a tank with an
established algae problem?

CO2 does NOT affect KH.

There is a direct relationship between CO2, Ph & KH

If you add CO2 the PH will drop - the KH will stay constant

If you take it away, the reverse happens

Things that affect KH are things like limestone in the tank which will raise
it (and with it the Ph at a given CO2 level.

Over time KH will gradually decrease as the buffer gets eaten up (all other
things being equal)....this will mean that your PH will gradually fall with
it at a given level of CO2. When KH gets to 0 then PH will crash. At KH
levels of below 2gDh KH becomes much less stable.

KH is much harder to move than either PH or CO2 levels. As above, add CO2 &
PH drops quite quickly - KH won't move.

Raise KH by having some source of calcium in the tank, lower it by filtering
through peat.

HTH

I.