Root Problem

Hi Guys I have been growing for just over a year and am on my 5th grow. I have learnt everything from this wonderful site and people. I have never had the need to ask a question because I found it all from the FAQ and questions others had already asked. However I have changed the bucket size from 5 litres to 10 and these buckets have a lot of large drainage holes.

I have 5 plants in these 10 litre pots. I have just gone past 1 week in growth cycle and my ladies are growing beautifully. I am happy as Larry. But the roots of the plants are coming out of these holes and are about 2cm long. They are turning brown and only noticed it yesterday. I have raised them a bit so they don’t sit in any run off water.

Getting to the point is it okay? Will it cause any problem like root rot?

All the 5 plants are in their individual 10 litre buckets
Your answers much appreciated.

im going to stick around for this 1 but from what i hear when your roots come out the bottom and hit light/air they get whats called air/light pruned and has no affect on them but again i only heard that from 1 place so i will stick around for more answers regarding this