those will not support a clam for long. In order for T-5s to be efficient enough for SPS and clam growth they should be individually reflected. Its a nice setup but if you had reflectors for each bulb, it would be 10 times brighter in the tank. Then you would have enough lighting for high light corals.
read up on T5 HO's and T-5V-HO's You will get a lot of info on them and there pros and cons of course, an you will also be able to see some tanks that are properly run on HO lighting.
