I've read some articles on DIY chillers. Some say to coil tubing into a mini-fridge and that will lower your water temp effectively. Other articles say that a mini-fridge won't work and to use an air conditioner to cool the tubing instead.
I have a 90 gallon discus tank with 260w PC
lighting on for about 10 hours a day. I usually keep the tank at around 84 degrees. On hot days, the temp can easily reach around 88-90 degrees. My fish don't seem to mind it, but it really messes up my plants.
What do you suggest I do?