HELP!! found little sprouting plant next to my plant?? is it bad?? what to do??

OK, 1st I'll shed some light on my situation... I'm using coconut crop circles.. kinda like coconut chips as my grow medium (NO SOIL WAS EVER USED!!) I'm in the end of my last stage of veg and I've been using Aquacana products for nutes and additives.. I'm using the ebb n flow (flood and drain table) and my plants are in smart pots..When I started I used 1 seed per pot as well...EVERYTHING IS also BRAND NEW!! (meaning- nothing was ever used for a previous harvest nor did I buy anything used or 2nd hand from someone else) I purchased my seeds from a seed bank..I did not get them from someone I knows harvest either.. So, now that you know all that.. This morning when I went to top off my reservoir (when doing this I always move all my plants to the end of the table for easier access) when I picked up a plant from the middle I seen there was a little plant that looks like a newly sprouted MJ seedling growing in the same pot next to my other plant..I really have no idea what this is or if its harmful to my big plant??(I also am 100% sure there was only 1 seed per pot)..I tried google and I was only able to find 2 post about this but in both the post the growers were using soil and were in the beginning stages of sprout..( I'm not using soil nor am I in the beginning stage of sprout though) the responses to the post were that its a weed (and not the good smoke-able kinda weed either) LOL and that its a pretty common problem with growers using soil.(although I cant find anything other than those 2 post on the subject)..the responses were saying pollen or other seeds sometimes get into the soil and cause the foreign weed to grow and that its harmful to the plant so it should be removed..but like I said I'm not using soil and I'm not in the same stage as those growers were so I have no idea what it is or what I should do about it??.. but I do have to say it really does look like a MJ sprout..can the roots sprout leaves and grow another plant??? sounds kinda crazy but I'm clueless to this..I've never heard of anything like this nor can I find any research on this matter.. SO, I was hoping one of you VETERAN GROWERS could inform me on this information and tell me what I should do and what would cause this..All my plants (this one included) look so healthy!!! I've really had an easy time with them so far...(knock on wood) I would really hate for this to be a problem an me not to fix it correctly and it spread to my other plants as well...SO SOMEONE PLEASE HELP.....

Doesn't matter much what medium you have, a small seed can hide just about anywhere, think of a dandelion. Heck, you could of even carried it into your grow room on your body. You have struck my curiosity though when you say it looks like a MJ seedling, does it just have cotyledons or does it have true leaves? How old are your plants? If it didn't come up with your seedlings I'm guessing it wasn't in your medium before hand. There is a species of tree that grows new trees from the root system. There are whole forests of them, above ground it looks like hundreds of trees, but they are all part of 1 plant. Never heard of an MJ plant doing this though. If your worried, just pull it up. Or you can let it grow out a little and see what it is.

intriguing if it is weed

I pulled it well more alike dug it out... and Ya, that's true about carrying a seed in ( although I'm so starile about my room though,change clothes, sanitzer and all b4 I and only I enter) or it already being in the medium but like you said I figured if it were in the medium it would of sprouted when the MJ did or sometime right after... and my babies are around 5 weeks old...and the little thing that was given me the head ache (lol) has leaves..you know when the MJ just gets its 1st 2 leaves;. 1 on each side..that's exactly what it looks like...I think the leaves look sooo much alike same color, same skinny pointed, jagged looking edges..t..I'm gonna try and upload this picture..and maybe you can see what you think...thanks sooo much for commenting..I'm kinda new to all this and am relying a lot on research and opinions from.. other people in forums to make my plants the best they can be

(regarding pics) The little thing looks all shriveled up I shouldn't of waited so long before I took the pic but you can see it a little and I also took a picture of the one it was growing next to..

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I pulled it well more alike dug it out... and Ya, that's true about carrying a seed in ( although I'm so starile about my room though,change clothes, sanitzer and all b4 I and only I enter) or it already being in the medium but like you said I figured if it were in the medium it would of sprouted when the MJ did or sometime right after... and my babies are around 5 weeks old...and the little thing that was given me the head ache (lol) has leaves..you know when the MJ just gets its 1st 2 leaves;. 1 on each side..that's exactly what it looks like...I think the leaves look sooo much alike same color, same skinny pointed, jagged looking edges..t..I'm gonna try and upload this picture..and maybe you can see what you think...thanks sooo much for commenting..I'm kinda new to all this and am relying a lot on research and opinions from.. other people in forums to make my plants the best they can be the little thing looks all shriveled up I shouldnt of waited sp long before i took the pic but you can it a little and I also took a picture of the one it was growing next to.....
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I have one doing the samething. Mine is a bit older then yours but this little sprout came up a few days ago. I'm going to kill it but I'm going to let it go a little bit just for curiosity.