The yellows are amazing together. They graze independently in a particular corner/side of the tank and then as a group they swim to the other side and begin grazing again. These fish were eating as they were acclimating and a few started eating as soon as they were dumped in the tank. They add a really nice splash of colour to the tank and it seems to liven it up some more.
There were 9 originally, then 2 went missing, bodies never to be found, and then yesterday the two on the sand. There are 5 left. I don't think they are picking each other off, there is/was no physical damage or evidence of any external problems.
The skimmer gets emptied every other day, usually every day. By day 3 it is overflowing and foam is coming up out of the air vents in the collection cup lid. This thing is amazing.
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