Scotts 4 gallon pico!

I recently purchased an Innovative Marine 4 gallon pico tank to house a yellow clown goby my girlfriend got attached to. It's been getting beat up by a chromis lately so she wanted it in its own tank on her desk.

Without droning on and on about the why's here's the goods:
Photo Album - Imgur

Does anyone have experience with Innovatives LEDs lights? Can they house at least low light corals?

Since there will only be a yellow clown goby, starfish and a small clean up crew how often would I need to do a water change?

Is there a better "after market" return pump for this pico to add more flow?

And lastly, does the "Spin Stream" work as well as the advertisements say?

 

Can't help with the LED question.

On the pump I am sure if you can find one that will fit the allotted area you may well find a more powerful one. The manufacturer may offer one.

I would probably consider 25% per week because it is so hard to feed one fish without overfeeding.

Not sure on the spin stream.

 

Just gonna stay with the stock parts for now they seem to be working fine. Fragged a piece of my zoa last night and put it in there. Within an hour my starfish found it and decided to give it a hug and dropped it behind a rock. Damn thing haha.