water temp?

in my first dwc grow, what is ideal temp / is 65 too low?

no, you are over thinking it

temp should be from 60-75. 65 being ideal as this is the temp your water will hold the most oxygen.

If my nutrient temperature reaches about 80F will this be okay?

bam bam said:

If my nutrient temperature reaches about 80F will this be okay?

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it is not the worst thing, but can lead to stunted growth and promote pest problems / other parasitic agents. It also cuts out the amount of oxygen going towards your root system and can be lethal.

Keep your temp down!