tank problem

I have a 7-8 gallon nano reef tank with a juvenile clownfish. No matter what I try to water temperature keeps increasing. I have frozen water bottles that I have on hand and use regularly however its time to look into a tank chiller. My tank goes up to 81.5 degrees which I know isn't good for my...

I know someone who bought a tank and on the way home with the cold and vibrations the trim on the corner of the tank cracked. The cracks are on the bottom trim. Any ideas on how safe is it to setup this tank are welcome. I know that many people have used rim less but are they built the same. the...