I take it you don't like researching much? A simple search pulled up about 10 threads with over 200 posts on the subject of mini marbles.
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Trust me i searched.. I found nothing!
Maybe its the Danish google.
I acually searched again while writing this answer..
Having this kind of "nitrate insurance" is great. Especially if you travel for work (like me) and in case things come up (as they often do in life). this way if I have a life issue and the tank goes a week or two without a WC I'm not facing death or danger to my pets.
Its a shame noone really knows anything about the Mini Marbles.
Loads of people know about it but you are asking In a thread titled p14
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Use a drip system then no roots or WC needed lol
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T1 I'm still aspiring to make it to your level my man!
Some day I'll have it all automated, I plan on selling this house in the next year or two and then build my next tank into my next home with a system like yours!
To the OP: P14 generally stay a bit smaller than p13. But that being said, any female could get huge. especially if you feed and care for them right. P14 and all blackies are quite costly. Maybe start with true hystrix. They stay small and are much more affordable.