Ok, here's my suggestions:
Make more RO ice, but in the mean time, you can take regular tap water ice and put it in bags and float it in the tank
take the canopy OFF, or at the very least, leave it open, do whatever you have to do to pry it open
get that fan blowing across the top of the tank again, even if you have to stand there and hold it, you really need to get the temp down. if you have more than one fan, get it aimed at that tank
turn any powerheads off
turn any extra filters off, including uv filters, leave ONLY your return pump running, even turn off the skimmer if it runs with a pump
make more ice, RO and regular tap, the RO can go right in the tank, the tap needs to float in a bag
get a digital thermometer