Originally Posted by 1077
Thanks so much . My own extensive searches do indeed list those as contributers but when primary causes are asked for ,all my searches indicate excess nutrients,phosphates, silicates,and dissolved organics/waste. Searches for biologist's views,government studies,etc all seem to incude the same info. Is it possible that the causes are too numerous to excude that which is most often sited? or are all but a few ,,simply ignorant? Could it be that there are as many causes as there are ways to be ignorant?
most of these studies are of river systems right?
could they not be a little bit different to the way your tank runs?
could you leave your tank in direct sunlight for 10 hours and not get algae?
back to aquariums.
i understand that ppl get algae and test the tank and find nutrients(phosphate or nitrate) high and immediately conclude that these high levels caused it.
could it have not been just poor tank maintenance?
dirty filter, also having knock on effect of reduced flow?
low oxygen levels?
other nutrients in low limiting levels?
low co2 levels?
too long and high light?
when ppl get algae they usually do a few things and i'm sure most here would advise the following....
frequent large water changes?
general maintenance and filter clean etc? (this would also improve filter effeciency and flow)
lower lighting.? (duration and or intensity)
reduce fish feeding?
all sound good? most ppl would do a few of these to fight the algae?
so, manually remove the algae, do a few large water changes and some of the above and algae has gone, yeah?
"sweet that was because you lowered the nitrates/phosphate etc etc........."
when ppl do a water change they would usually remove the algae manually plus the waste water would remove many algal spores, 50% W/C would be around 50% of the algal spores removed, i guess?
so a few of these water changes would not "just" lower the nutrient levels
i would do the above in my old low tech and my algae would go.
my tap water has 40pp nitrates and 4ppm phosphates. so was i even lowering the nasty nutrient levels?
maybe a bit, but still high levels for a low tech, yet the algae would go.
how could this be?
maybe it was the other factors that influenced the disappearance of algae more?
because it wasn't taking the nasties to low levels that alleviated the problem.
my current tank has high light and high levels of ALL nutrients,
but if i was to let the tank maintenance go a bit,
no filter clean for few months,
no water change for a week,
no water top ups so co2 levels drop (due to increased surface agitation),
obstructing water flow with unmaintained plants,
removing dead leaves etc.
then i would more than likely get algae,
if i keep up on the above then i dont get algae.
nutrient levels (nitrates phosphates etc) would likely be very similar in both cases.
so in my tank i can safely say high nutrients are not causing the algae if any has appeared.
to quote byron from another thread.
Originally Posted by Byron
There are people who believe the earth is flat, notwithstanding scientific evidence to the contrary.
he is totally hitting the nail on the head.
the world is not flat,
and neither does high nutrient (no3 po4) levels CAUSE algae.