Maximum Safe Temp for Swordtail Fry?

[Bradder]

I am trying to slowly raise the temperature in a 46 US Gallon tank to treat a (minor at this point) outbreak of ICH. All recommenedations I have read indicate a temperature of 86F with salt treatment. Right now the tank is stable at just under 85 and the ICH continues a bit. I would like to raise it a bit a degree more but am afraid that in doing so I will raise it above 86F a bit and then have to cut the temperature back- heaters just aren't that precise, ya know?

I can find information on the *ideal* temperature ranges for swordtail fry, but can't find any information on how high a temperature they can tolerate before it becomes dangerous. I am thinking, in the worst case senaria and with me checking the temps regularly, the temp may raise to 88F before I can perform a thermostat "reduction" to get the steady treatment temp of 86F. Would 87F or 88F be pushing the limits or should the 85F be sufficient for the treatment? How long could they tolerate the higher temperatures?

Any advice is greatly appreciated!

46 US Gallon
3 week-old swordtail Fry
Ph 7.2
Amonia 0
Nitrites 0
Nitrates 5

Salt treatment: 2/3 T per 5 gallons
Temp: Steady 85F
Two aristones
Have also lowered water lever a bit to allow filter return to break surface

 

[JeremyD]

Thats already higher than I would ever recommend going! I would only go up to 82 degrees max.

 

[tazco]

So its boiled fish then, can i have fries with mine.

 

[joey54180]

that is way to high they should only be at 82degrees just medicate the water

 

[Zenn]

I have mine at 30 degree Celeus...

Yeah it is high, but they are fine, in fact they like it that warm, but once they are old enough i am going to reduce the temp

But Fry survive well in the temp and water that they are born into...