questions on my HOB overflow and my sump

x17x11x

Member
Reef Central Online Community - $15 PVC Overflow

^this is basically what it will look like insted of 1 inch to 1.5 inch pipe im using .5 to 1 inch pipe and also. what is the maqin purpose of them check valves with the air lines hooked on to them like seen on page 10. < is that something i should do aswell. would it be alright if i just run pvc into the sump rather than a hose? i figure its less spots for possible leaks. ALSO my baffles for my sump. should i drill holes into them? or just stagger them? next for my return pump i planned on a small fountain pump and adding a hose yto run it up to my main tank, is this okj? last. i have a 125 galon tank. will a little 10gallon be ok for my sump?
 
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