Thanks allot to everyone on the suggestions.
As ice is now gone I am attacking the Chara (some it now released upon its own and floating) with rake and Aquashade. Debate is out on putting bottom aeration in due to weighing the benefits for versus not doing much at all. I hear that it does not have negative results but I don't hear how positive it is in keeping the Chara down to a minimum to alleviate the raking time (which is becoming less and less with other non-fish activities).
At this point I am not worried about the DO or increase of temperature(can be controlled by type of diffuser, etc.) - my analylis now is can the aeration keep in check from Chara in spreading and minimize the existing growth down to 50% or better to justify the expense for this 1/2ac pond.
Any suggestions again is helpful.
