175W DE is a rare MH configuration for aquaria.
If it says "HQI" then you must get a 175W HQI ballast. You'll also need a fixture with a reflector and UV shield.
You've kinda gone about this backwards as most people get the fixture/ballast first before deciding on the bulb.
Also, not sure what kind of performance you'll get out of $10 bulbs (esp. if they're 20K).
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