The information you have been given is quite correct: the Lobsters will eat each other, so use separate tanks.

Presumably I'll have to transfer them to a separate tank first, but should it be planted or bare?

To avoid this, the mothers-to-be are moved to a separate tank.

It had two separate tanks, one for paraffin, and petrol.

There were 500,000 gallons of fuel on board, in 17 separate tanks...

There was even hot and cold running water, from two separate tanks, although it took a lot of experimentation to get the balance right.

I suggest you move the newt and frog to a separate tank.

Although a part of her could not forget that they were in separate tanks, yards apart, she also felt his familiar presence.

Because of its high power, the oscillator sits in a separate tank.

The waste by-products,of the first reaction were collected inside a separate tank, ready for burial.