"dean coclonis" wrote in message
. ..
I am running a wet/dry trickle system on a 100gal tank with the defuser in
the sump - the outlet is directed straight at the inlet of the return pump
which directs the return to minimise surface disturbance. I seem to get
an
inconsistant growth rate across the tank

What exactly do you mean by an inconsistent growth rate across the tank? Are
you saying that plants in one location grow better than in another? If
that's the case, it's unlikely that it's due to some kind of an uneven CO2
distribution in the water. I don't know how that could happen, unless the
circulation is very poor, which I doubt is happening with your equipment.
Maybe the the light intensity simply varies across the tank (because tall
plants are blocking the light in some places).


using dupla laterrite
an Australian product Aquasonic basic Grow and daily drops

Do those products list their composition? I'd make sure they include all the
essential micronutrients. You don't say if you dose any macronutrients
(KNO3, K2SO4, etc). If you don't, perhaps your plants are limited in
potassium or nitrate, which would cause the growth rate to be slow. In a
nutrient-poor environment, some plants will outcompete others for nutrients
and grow better.

fluval 404
PH 7
KH 6

That only means 18 ppm CO2. I would increase the CO2 flow a little to make
it be around 25 ppm. Don't worry about surface agitation in your trickle
filter driving off the CO2. More agitation causes the CO2 level to be more
stable.
__
Alex
pcalex (at) hotpop.com