... bad advice everywhere these days...
yeah, it's a weed and it will grow. why waste your time growing ditch weed when you can buy it for basically nothing anyways? at least there is no risk of cultivation charges.
not to mention, it is an auto and that thing is so far behind it will end up yielding a couple bong hits.. in which you will need to smoke all of it to get a buzz anyways.
also, that bit of hydro advice was useless for the op, and no need to keep temps so high anyways.
do not just put tap water in a glass and water your girls.. not very likely your water comes out where it needs to be. get some garden lime if that is a soil mix youre using and start reading asap so you do not torture your plants