i have a 45 gal fish tank with one betta fish. the tank is on the floor. chewy has a playgym hanging from the ceiling, not directly over the tank but probably less than a foot away. yesterday i did a 95% water change and spent about 2 hours total cleaning it really well and swishing the substrate ect. this afternoon i laid on the floor and watched charlie, my fish, swim for a bit. about 45 minutes but i started falling asleep. in the evening i fed charlie dinner and watched him swim a bit and thats when i noticed the sprouted seed. 1 single seed. it was green on the end and about an inch, maybe 1 1/2 long. i think its millet. i pulled it out, it was actually rooted very well. i have no idea how long it was in there but i'm guessing a while judging on the size. i know live plants are very good for fish but is millet? would it have continued to grow or have died? i'm guessing millet or any other bird seed isn't aquatic? the tank has a full lid and i really don't know how it would have even gotten in there.. i actually had to rip it out of the substrate (a mixture of gravel, pony beads, polished rocks and marbles. should i let it try to grow if it happens again? has this happened to anyone else on here? my sister has a cockatiel and she said it happened to her when she had a turtle but she always ripped it out.