Thanks all
I have noticed some rather strange behaviour from the spotties, a couple of times when I have approached the tank one or two spotties will be heading back to the bottom of the tank from the surface which I thought was a little unusual
Tonight I have been watching them and they are actually going to the surface and swimming upside down in amongst the thick raft of duckweed that I have at one end of the river tank
I am thinking of five possible explanations:
1 - There is food trapped in there, but 90% of the time sinking food is fed to them so not sure.
2 - The thick raft of duckweed is home to baby Cherry shrimp
3 - There are lots od baby ramshorn snails in the tank could they be eating those in amongst the duckweed
4 - Actually eating the duckweed
5 - Tonight I saw 5 of the 6 spotties in the duckweed so the only other possibility could be spawning activity
