Hobo-Tastic has become a little less hobo and a little more tastic.

My friend has recieved a nice 400 HPS on loan and promptly converted it to remote ballast and hung it up.

Also, he has put in a temp gauge and humidity gauge.

He has been trying his best to control the ph with lemon juice and will be out to get some real ph down tommorow. after about 4 hours the ph goes from 6 to 8. What do you think he should strive for? 5.5? 6.5?