the over all will most likely support the weight, my thought is that each leg comes to a "point" so to speak. granted the weight is basically even throughout so you might be alright im just thinking out loud.
put it this way. stand on 1 nail. now stand on 1,000 nails put close together. the 1 nail will puncture your foot because the weight on the small surface area creates a pressure point, the weight on the 1,000 nails will prob. not hurt because theres more surface area and the weight is spread out. your chair legs are like 8 nails, a reg. rectangular tank stand would be like 8,000 nails. again im just thinking out loud but i hope that makes sense.