whats my stump

got this a while ago.
not sure what it is.
im guessing more then 6 months ago i put it in a 20g tupperware full of water outside.
changed the water the first few months then stopped.
then a few months ago i added mosquito fish,water lettuce,and more water plants.
water has been clear for a while with no water changes.
i was soaking it for my pond but im thinking of maybe putting it in my 240g.
opinions?
type of wood?
safe to add to tank?
worst that will happen is the water will brown?
sorry for the long post and questions.
just setting it up and dont wanna screw it up.
if this is the wrong section,sorry.

no,looks it cus its wet.
i got it when it was cut a year or 2 ago,or more,dont remember.lol
then added it to the tupp of water.
thats it.

Tongue33;1363644; said:

Is It willow??

Click to expand...

no clue
i guess lets start over.lol
does it matter what kind of wood you use?
and after what ive done would it be safe for my tank?
will it always brown the water?
thanks for the replies