New 75 gallon reef

[Reefnoob84]

So ive had the 46 gal bowfront going for 2 months now and unfortunatly the home that were renting has a bad mold issue and we are forced to move to another home. Good news found a great place with plenty of room and since were moving may as well upgrade the tank.

So i bought a 75 gal reef ready all glass brand with a 200 watt jager heater 40 lbs live sand a 2 bulb freshwater light a small amiracle sump(8"w18"l14"t) with a rio 1700 pump that works along with some other misc crap. got it off cl for 150

So my question is what to do about sump action and what not.

I have going on my 46 a coralife 65 gal skimmer probably going to get another identical one and a eshoppes sump not too sure gal size(12*18*16) with a 2500 aqueon sub pump. i also have a 10 gallon laying around.

i want a refugium and all of my stuff to go in the sumps.

should i use the hob overflow along with the tank overflow?
i have plenty of power head flow (2400gph)
or should i piggyback all 3 tanks together?

i can fit all 3 under the tank and make it all work on gravity i hope(except the obvious return)

thanks for your help i will post pics soon of the new tank

 

[Reefnoob84]

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and the glass 10 gallon

like i said i want to use the 10 gallon as the refugium and the other two as holding tanks or other filtration? Ive read alot of pros and cons about bio balls what do you guys think? i have um, use um or throw them out?