"High temps on a peak in the day I can deal with, High temps consistantly..I cannot."
I guess you need to quantify what "high temp" is. To me it's anything well over 90 degrees for a significant(read: 8 hours+) amount of time. If the natural temp swing of your tank is 82-86, thats normal and I doubt you'll see any detrimental effects.
"I agree completely that I can raise my temp a great deal and still be quite safe and maybe even see some benefit, in fact I might do just that, but there are some nasty, sess pool, tanks out there that D.O. is a problem, so I don't feel that you can just blindly say D.O. is not a problem, it is! "
Come on you expect me to qualify every statement? Yeah if someone has a tank with absolutely no circulation, no biological filtration whatsoever, and dead decaying rotting flesh of corals and fish, then yeah DO is a significant problem =)
But if the tank has been set up properly, has a protein skimmer, decent surface agitation, I still maintain that DO levels will not surface as a problem.
"Besides you know as well as I do those damn fish could swim where the oxygen was. The corals couldn't!!! Poor corals stuck there in that stagnant water while the fish used up all the O2."
Come on you're reaching now =) Who has a higher o2 demand? The fish right? If they used up all the o2 so that corals were dying wouldn't they be dying as well? I'll even grant you that when the water was at 105 degrees that the o2 levels did come in to play somewhat since there was so much decomposing and what not occuring in the tank. But thats also at 20 degrees over normal seawater temps! Take that same reef and drop it down to 65 degrees and sustain it there for 8-24 hours and tell me you won't see similar die-offs. But I'd bet that 65 degree water is gonna have one hell of a DO rate =)
I maintain that at NSW levels, dissolved oxygen rarely if ever is an issue, in the average reef tank.
BTW, no offense either taken, or implied, I enjoy a good healthy debate =)
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[This message has been edited by MickAv8r (edited 29 November 1999).]