Topic: Should we merge these three artist tags?

Candy_dem0n, candy_b_black, and candyhotpony seem to be the same artist. but his or her art seems posted under three different names, making it hard to find. I get the confusion, as whenever he or she changed names, the watermark also switched, but maybe we could have some way of merging this.

What you are looking for is called e621:Tag Aliases.

You would normally just submit a simple alias request when you want to permanently merge two tags together.
However, for multiple related tags, you should use a Bulk Update Request (BUR) instead.

The proper procedure is to alias all lesser known names to the most commonly used name (e.g., alias nickname -> full_name). I will submit this one for you. (see topic #62677)