mmkeeper
Well-known member
What is the difference? Can too much direct flow cause either?
Stn Rtn
- Thread starter mmkeeper
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NC2WA
Well-known member
What does STN and RTN stand for? I do not keep SPS which is why I'm asking. 
james734
Well-known member
Slow Tissue Narcosis(I think that's the spelling), Rapid Tissue Narcosis.
Basically the tissue of the coral recedes Slowly or Rapidly.
Not sure whatt the true cause is though. I have some corals right now that are STN'ing a little. I haven't figured out why yet, but been looking. I think it all started with a power head that fell and was pointed directly at one of them. It started to STN and the other's have just followed along with them. My Alk got a little high after I must of bumped the effluent rate of the CAL Reactor also. With that down now I would think it would have stopped, but I still noticing some tissue loss on a few. What's weird in my case is some of them have tissue loss and others don't. What ever my cause it's been going on for now approx 2-3 months.
Still trying to figure it out.
Basically the tissue of the coral recedes Slowly or Rapidly.
Not sure whatt the true cause is though. I have some corals right now that are STN'ing a little. I haven't figured out why yet, but been looking. I think it all started with a power head that fell and was pointed directly at one of them. It started to STN and the other's have just followed along with them. My Alk got a little high after I must of bumped the effluent rate of the CAL Reactor also. With that down now I would think it would have stopped, but I still noticing some tissue loss on a few. What's weird in my case is some of them have tissue loss and others don't. What ever my cause it's been going on for now approx 2-3 months.
Still trying to figure it out.
mmkeeper
Well-known member
You think that having the powerhead flow too close or too direct blew the tissue off?
james734
Well-known member
I don't think it blew the tissue off, but stressed the coral more than anything. To much direct flow isn't good. I knew that but I just wasn't paying to much attention to the tank for a while and missed the fact the power head had fell.
NC2WA
Well-known member
Thanks for the definitions. So is RTN and STN apply to LPS or just SPS corals??
mmkeeper
Well-known member
The way I understand it, it is SPS.
james734
Well-known member
SPS is correct..
NC2WA
Well-known member
Cool. Thanks..No worries for me then as I only have LPS. No intention in keeping SPS.
james734
Well-known member
You say that now......
NC2WA
Well-known member
well, I plan on keeping several large angelfish in my tank and I've been told that SPS and angelfish are not a good idea. So there is a high probablity that SPS will never make my tank.
kevinpo
Expert
Too much direct flow by itself will cause tissue loss in a localized area only. If it continues after removal of the flow then look for other stress causes.
FYI Angelfish (both dwarf and full size) are much more likely to eat and/or cause serious damage to LPS type corals than SPS.
Regards,
Kevin
FYI Angelfish (both dwarf and full size) are much more likely to eat and/or cause serious damage to LPS type corals than SPS.
Regards,
Kevin
