m walczak wrote:

So I have situation related to this Agitation topic. I have a 29 g
planted tank with DIY CO2 injection. Initially, when I step up the
tank I was just getting into fish again and did not plan on a planted
tank. Heres my problem:
I can not get my pH below 7.5. I have a UG filter and it agitates the
surface along with my over the back filter. I have gone to the
extremes of adding another bottle. one has an actual fine bubbler
stone and the other has a fairly large bell diffuser. I dose with PMDD
and my other stats are as follows,pH 7.5 KH 6, GH 9,NH2/3 0, NO2 0,
NO3 .15, Fe .10, Phos 0, 3.8 wgp (i defiantly need co2). Any
suggestions on how to lower my pH? MY plants are growing well but I
have a small fuzz or hair algae problem and growing red/ bread algae
problem, that has been ongoing for a couple months now and I think it
may be do to low co2 since there is little or no pearling most of the
time. And I think this low co2 may be from too much surface ag. Any
suggestions on possible solns?
of lower co2 or more importantly the algae...

One issue at a time:

You say you cannot get your pH below 7.5, despite 2 simultaneous bottles
of DIY CO2. Please clarify: What is the pH of your aquarium water WITHOUT
CO2 injection? In most cases, two bottles of DIY CO2 should be more than
adequate to drop pH in a 29 gallon tank by 0.5 to 0.8.

Secondly, your tank stats look good, except for phosphate. Plants need
more than zero phosphate! An archive search turns up discussions like
these:
http://groups.google.com/groups?hl=e...f87a635&rnum=1