184g basement 8ft reef

[Roskoreef]

Ok so i got new bulbs for this mh fixture.... one already blew and cracked...im wondering ive done something wrong or faulty bulb. Its a maristar 2x250w mh with old huge ballast(rated for 2x250w) and 2x39w t5ho, all good for 3 days and now this afternoon only one is on, and other has big crack on bulb (hamilton 20k de 250w).

this is the frag tank before the light blew out,



Am i using the wrong ballast for bulbs?

grr, they were stupid expesive cause i was to eager to order online, anyway also picked up a small skimmer to replace my other 2...just giving it a little clean with vinegar(its used).