Missing snowflake Eel mystery solved: I pruned my chaetomorpha back which provided a good view of the refugium last night; This morning when I checked the sump area, low and behold, the Eel's head was poking out a hole in the rubble rock. What a pleasant surprise. Not sure if he ate my crabs or snails or if he was just really hungry, but he ate a hole silver side minnow. I'm not exactly sure how he got down there, but the only way down is via the overflow down through an inch and 1/4 durso stand pipe, into a filter sock, through the first stage of the sump with the skimmer, and into the second stage, and finally into the rubble rock hidden by chaetomorpha.
Still no Eel and no sign of death in the tank. The stringy algae at the base of the rocks has gone away. The algae might just be the result of the end of the nitrogen cycle.
Added a Copperband Butterfly today. I fear I've made a mistake by adding this fish. I fear taht he will eat all my copepods and other beneficial critters for keeping my dsb healthy; however, I'm fighting colonial hydroid that hitchhiked in on the base rocks that I seeded my dsb with (irony). The dsb is new and under developed at this point, so I'm hoping that the copperband attacks the hydroids, then I can re-seed the dsb; otherwise, I'm going to remove all the live rock and start over: last resort.
Haven't seen the snowflake eel since 2/21; I suspect he escaped. I didn't have escape routes sealed properly. It has been 4 days and if he was dead, I would think the ammonia, nitrates, and phosphates would spike; also, waiting for cleanup crew to start congregating. I have since, customized my tank portal covers to support power-head cable and light mounting brackets; all escape routes have been closed.