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Thread algae has recently been an issue in my MH/T-5 setup. I let the CO2 get low and within a week it was an absolute disaster. Now, more than a month later, it's finally starting to come under control again.

Very intense light is possible to deal with, but everything must be perfect all of the time. CO2 simply MUST be optimal - good concentration and good distribution througout the tank. Other ferts must also be kept strictly in line. Any deviation and things crash hard very quickly.

Most people who use MH in a planted tank only keep them going for 3-5 hours per day. You can use some other less-intense light for regular viewing for the balance of the day.
 
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