GWU, 
 
 I know you are one of the big master here.  any suggestion is good to me, as i am a new learner.
you fill up some penny in my pocket.   

 I will never say anyone against me.  the more you speak, the more I learn.
i really know none about plant and fishes.  but, keep reading old post to catch up.  haha.
yes, temp made me trouble, as I don't have a cooler.  but, I will change from this 18" tank to a 4', which i will receive it this week.  and i will get a cooler to make my tank more stable.  by the time, i would need your help for the design.   

   any defensive word are welcome to make it better.  haha.
thanks again.