Mats under rimless tanks
I recently set up a RIMLESS 20 gallon long. Unfortunately, I did not put a yoga mat under this tank. There is water and a colony of shrimps in there right now. After reading some horror stories online about rimless tanks busting at the seams, I'm considering draining most of the water and putting a mat under the tank. HOWEVER, speaking to to other hobbyist some say its really not needed for smaller tanks. The tank is on a stand that is pretty level. Not perfect but only about 1/2 cm off. I have mats under all my other rimless tanks, I just skipped a step this time and I am kind of regretting it.
Should I stick a mat under anyways?