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- Newsgroups: sci.aquaria
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!cs.utexas.edu!hermes.chpc.utexas.edu!news.utdallas.edu!corpgate!brtph560!brtph598!bhaskar
- From: bhaskar@brtph598.bnr.ca (Shaji Bhaskar)
- Subject: Re: CO2 levels
- Message-ID: <1992Nov23.020951.27843@brtph560.bnr.ca>
- Sender: news@brtph560.bnr.ca (Usenet News)
- Organization: BNR Inc. RTP, NC
- References: <1992Nov21.164728.16086@vax5.cit.cornell.edu>
- Distribution: sci
- Date: Mon, 23 Nov 1992 02:09:51 GMT
- Lines: 44
-
- In article <1992Nov21.164728.16086@vax5.cit.cornell.edu> mdkj@vax5.cit.cornell.edu writes:
- >I have been keeping plants in my two tanks for quite a while, and although they
- >grow well, they tend to stay smaller than what they were when I originally
- >bought them. As an example, I bought a giant amazon (A. bleheri) 6 months ago
- >with leaves (plus stems) that reached about 15 in. Now, all new leaves are
- >only half that size (most of the difference is in the stem). The same happens
- >with my cryptos and hygrophilas.
-
- The difference in stalk length of the sword plant could be because the
- plant you bought had been grown in crowded conditions, forcing the
- leaves to grow longer to reach the light. Still, 8" is rather small
- for an E. bleheri leaf. I have noticed that some species of crypts
- (C. nevilii for one) tends to have smaller leaves in my tank. I think
- this was probably because the plants I bought had been grown emersed.
- However, Hygro species usually have larger (and sometimes dramatically
- different) leaves under water than above, so you should not be seeing
- a reduction in their leaf size. What species of Hygrophila do you have?
-
- >I add weekly iron and trace elements, and have laterite in the bottom gravel.
- >I use 3 40W Triton bulbs on the 70G tank and a reverse-flow Eheim undergravel
- >filter. I have a relatively small amount of
- >hair algae among my floating plants.
- >My question is: could this lack of "big" growth be the result of CO2
- >deficiency?
-
- You could try adding a couple of 40W lights. But if you are asking
- whether your plants will grow bigger with CO2 than without, my experience
- says yes. I am sure most people who use CO2 injection will agree that
- it is the most important aid to keeping lots of large, healthy, fast
- growing plants.
-
- >If so, what would be an acceptable level and how is it reachable
- >(preferably without having to buy a $$$ diffuser...)?
-
- About 10-20 ppm of CO2 is good. I don't know of any cheap (less than
- $100) way. The FAQ on plants has information on CO2 injection.
-
- -Shaji.
-
-
-
- --
- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- Shaji Bhaskar BNR, Research Triangle Park, NC 27709 (bhaskar@bnr.ca)
-