Originally Posted by Angel079
So 2 weeks without w/c then right? How long do you wanna go without doing one?
A filterless tank without W/C's would be similiar to a biosphere...
Kind of how I was planning on treating my invert 5g tank, so I'm interested.
One note on putting the sponge filter on a timer-
I actually read one book that reccomended turning the filter/airstone off 2 hours before the lights come on, and on 2 hours before the lights go off.
The reasoning is that plants absorb 02 AND co2 during photosynthesis, but their O2 production is waegh more than their intake.
When the lights go off however, photosynthesis stops- no more CO2 intake and no more o2 production, but they still take small amts of O2.
At least, I'm assuming. I know terrestrial plants do. Thats why hydroponics has to have an airstone on the roots.
MAybe tap water does have CO2, but I would think the simple act of running the water into a bucket would agitate it enough to force most of it out. I think the production of CO2 in the tank would outweigh the CO2 from frequent WC's- ie you're taking out more than you're putting in..
Oh, and my 10gal with cichlid fry has been set up for about 2 months now...
I think I've probably done 2 WC's and gravel vac'd for 5 minutes the entire time.
I'm not sure where the nitrates are going- maybe the algae are using it?
There's some java moss and java ferns... that's about it for plants...
Algae's not a problem for me anyway. I just scrape off the front glass, abd treat the rest as if it were a plant. It's not really ugly or anything.
Same with my guppy tank- I keep the front and side glass scraped, but the rocks and rear glass have a lot... The guppies like to eat it, and it filters the water. What's the harm?