people of means,six figure, catch on

Trevor Tondro for The New York Times

The Six-Figure Fish Tank Catches On

By JENNIFER A. KINGSON

Among people of means, expensive aquariums are the latest status symbol. Above, a 700-gallon tank suspended from the ceiling of a West Village town house apartment.

catch on

1. Understand, as in Aunt Mary doesn't catch on to any jokes. The verb to catch alone was used with this meaning from Shakespeare's time, on being added in the late 1800s. Also see get it, def. 2.
2. Become popular, as in This new dance is really beginning to catch on. [Late 1800s]