If you are going to grow tomatoes in pots then dont fill it all the way to the top, leave about 3" to 4" so when the bottom leaves drop off you can top up the pot causing the nodes to grow creating more roots.
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Good advice, davy! ;)
Never knew there was a reason for the gap even though I leave 3-4" gap in my tomato plant pots. (Learn something new everyday 8))