Bulb suggestions for a FOWLR
 

I have a 4 bulb t5 fixture on my fish only tank and I am wondering what bulbs to go with.

I would suggest 2 10000K and 2 Actinic

I would suggest something in the higher Kelvin like 14K or higher to avoid pest algea issues. Since you're not trying to grow anything with the light you can choose anything you like. Most reef guys that choose 10K do it because it provides good growth for thier coral. The actinics just add some blue so you don't see the natural colour of the 10K bulbs, and it makes the colour of fish and coral "pop". You can get the same effect as a four bulb 10K/Actinic with just two KZ New Gen 14K bulbs.