Bullfrog tads can take a year or two to morph out if the water temp is below 70F. Increasing it a few degrees will accerlate the process, but you don't want it to happen too quickly. Higher water temperatures are also linked to spindly leg syndrome - a pretty much fatal malformation of the front limbs.

It's a great looking tad and has good size. The bigger the tad before morphing, the better.