Herring really are a pain to keep.You need a rather larger round tank.They can will literally wear themselves to death in a square tank swimming into the corners.
The water needs to be kept really cool,meaning constantly adding ice.Unless you got a walk-in fridge in the basement!
The water also needs to be well agitated for oxygenation purposes.It also needs to be circulated at a rather aggressive rate or toxins can build up.
In the end a rather decent chunk of change has to be spent in both material and electricity to keep herring alive successfully on a regular basis.
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