You can use any pump, aqua lifters work well, swing by oceanic corals on Sunday and all bring in a jbj float switch for you (Im pretty sure I have 1 left from mine and I might have the parts to make a second one)

You can run it with just 1

Thanks for Ur kindness man but I don't think I'll b able to make it tmr. Oceanic is over 1hr drive from my house. Do I need 2 switches because one is for high and other is for low water alarm right?

Apparently I have to go to ikea next weekend... I can meet you there if you want

If you do the high low setup it will make your water level vary

IMO the best way to set it up is to do the setting with the sensor in your reservoir