Planktonic critters

[BCash74]

A few months back I peered into my tank a few hours after dark and was amazed at the “soup” of critters swimming around. I like to gaze after dark and can always find both pelagic and benthic copepods and amphipods, but this was crazy: thousands upon thousands of various critters:

These were by far the most interesting ones:

Any ideas on what these could be? Tank was up for 4-6 weeks at this point: stocked it with 100 bs TBS rock. Initially I thought I had one mantis shrimp: you can hear the click in the video. However, 6 months in, I’ve caught 6 mantis shrimp and my tank clicks more now than ever. Could these have been juvenile/early planktonic mantis shrimp?

 

[Tahoe61]

Wow. There's a lot going on in the video.
I suppose the long bodied ones could be mantis but purely speculation.
Do you feed any phyto?

Pretty cool.

 

[BCash74]

Wow. There's a lot going on in the video.
I suppose the long bodied ones could be mantis but purely speculation.
Do you feed any phyto?

Pretty cool.

Yes, I really wanted to keep the biodiversity on the liverock thriving, so I feed 5 mls of Reef Nutrition live phyto every evening. The tank is a 100g IM with sump.