A couple bait tank battery questions

[Dave k]

Hey guys,
I'm working on building a bait tank and have a couple questions. I've read through several online tutorials and looked at ones people have built and have it all figured out except for the electrical part, which has never been one of my strengths.

I'm planning on running a Rule 360 GPH pump. The flow rate on this is obviously too strong for a 5 gallon tank. Would rigging this with a 6v battery slow down the flow enough, or would I still need to add a timer switch?

Also, is there a on/off switch I can place somewhere along the wire? Where I'm going to have to mount the battery box might to be too difficult to reach while on the water.

Thanks in advance guys. I'll put up some pics once this is done (hopefully in time for this weekend!)

-Dave