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- Path: sparky!uunet!elroy.jpl.nasa.gov!nntp-server.caltech.edu!laurence
- From: laurence@cco.caltech.edu (Dustin Lee Laurence)
- Newsgroups: rec.aquaria
- Subject: Re: [M] Need suggestions on cowfish, rock anemonies, etc.
- Date: 21 Jan 1993 20:52:11 GMT
- Organization: California Institute of Technology, Pasadena
- Lines: 86
- Message-ID: <1jn2drINNdne@gap.caltech.edu>
- References: <2800266@hplvec.LVLD.HP.COM> <1j7jtqINNbte@gap.caltech.edu> <1993Jan17.182408.7013@athena.mit.edu>
- NNTP-Posting-Host: sandman.caltech.edu
-
- glee@athena.mit.edu (Gilbert Huppert) takes exception:
-
- [I mention using NaOH to kill Aptasia polyps]
-
- [ hopefully clear warning deleted]
-
- >I personally think that this is very dangerous, especially for someone not
- >trained in dealing with chemicals.
-
- I partly disagree. I don't think that just anyone should try this trick,
- and I thought I made that clear. However, the word _very_ is perhaps
- too strong. Any organic laboratory uses the stuff in great quantities.
- With _proper precautions_, NaOH is not a great deal more hazardous than
- the nastier household chemicals, and quite possibly less so than doing
- your own brake service or wiring the hood of a saltwater tank (both of
- which I have done, though I won't do the brake service unless I have
- more competent supervision). (Do they still sell the drain cleaner that
- was nothing less than a sulfuric acid solution? Probably not.)
-
- I said that if you don't have any idea what the precautions are, I didn't
- recommend that you attempt this, but if someone is determined I'd rather
- they get some help from me than try it with no help at all. However,
- there are clearly a number of rec.aquaria readers who have the knowledge
- and safety equipment, and there is no reason that I see to reduce my
- posts here to the lowest common denominator that we see other places.
- I would imagine that a post about wiring a light hood and stand for a
- marine aquarium would be of interest to those readers who have the
- appropriate skills, and I would argue that here the danger if a mistake
- is made are probably greater than making sodium hydroxide. It may be
- easier to ruin your eyes with NaOH, but it's easier to die from current
- flowing from your arm past your heart to a wet floor. (Not to say that
- you couldn't kill yourself with NaOH if you tried hard enough...)
-
- Side note: as education is why most of us read *.aquaria, I suggest that
- it would be a fine idea to put a few paragraphs of chemical safety and
- handling info in the FAQ (no, I don't consider myself competent to write
- it).
-
- [more hazards of NaOH deleted]
-
- Since you can't have missed my warning, I presume that you consider it
- to be insufficient. Thank you for adding more details.
-
- >My opinion is that you might as well use hydrochloric,
- >or any other strong acid, just as easily, and with the same dangers.
-
- Again, I partly agree with you. As far as the dangers go, HCl is
- perhaps of comparable risk, but I'd far rather mess with NaOH than
- sulfuric acid (which, unless memory decieves me, has fumes far more
- dangerous than either of the other two). I don't consider HCl to be to
- dangerous to handle, but I also have access to glassware, gloves,
- goggles, an apron, a working hood, and the advice of more knowledgeable
- people. Each reader must assess his or her own abilities and equipment,
- as they are in a far better position to do this than I.
-
- As for usefulness in controlling Aptasia, I disagree. I believe that
- NaOH is far better than any acid, though I'd be interested in hearing
- arguments to the contrary.
-
- >If you inject the solution directly into the tank, you are risking serious
- >pH problems.
-
- True, if you are foolish enough to inject too much. I have never used
- more than a half a cc, and probably quite a bit less. My solution is
- quite strong (rather stronger than optimal, I would say), and it takes
- very little. Again, I don't recommend this technique to those who
- are not ready to give it a bit of thought first.
-
- >On the other hand,
- >Ca(OH)2 is nowhere near as dangerous, and you should be able to make a
- >suspension fairly easily, and inject this into your target inside the
- >tank.
-
- Read the post. Calcium hydroxide has not worked well for anyone I
- know of. (Though perhaps someone on the net has a different story?)
- A technique that does not work is not an improvement.
-
- >Please think very carefully before adding any chemicals to your reef.
-
- This should go without saying, and I heartily second it.
-
- --
- Dustin Laurence "As sensitive and broad-minded humans, we must never
- allow ourselves to be in any way judgmental of the
- laurence@alice religious practices of other people, even when these
- caltech.edu people clearly are raving space loons." -- Dave Barry
-