Plumbing in a QT /frag tang

[Rookie]

So I was able to pickup 2 drilled tanks. A 30 tall and 30 gallon standard. Not sure which i am using yet, either way they will be gravity fed back to the sump.

When plumbing in supply, anyone have opinions on:

separate pump to move the water from sump to QT

or

branoff directly off the return? i have plenty of pump power left to do this and still balance return

Gravity won't allow me to branch off the drain.

 

[Limey]

Branch off so if anytime you have an issues huge you main off then you know everything off...

 

[Luke_L]

When you're branching off the main to run auxiliary tanks just remember to have siphon breaks... when power goes out and stuff back siphon weird things happen

 

[Rookie]

Tanks guys, good advice!

 

[Luigi]

when power goes out and stuff back siphon weird things happen

Lol, ...but you are right

 

[Rookie]

One more question, its filled and ready to go, should I do a few 5 gallon water changes and put the old tank water in "frag" tank to balance out the system a little or is adding 30 gallons of fresh mixed salt ok? Seems like id be doing a large water change when my system is running lean to begin with (hannah kit just started registering nitrates)

 

[Luke_L]

Generally for me if the salinity and alkalinity and temperature are good then I treat it as a water change , I've never had any issues, that being said 30 gallon on my system would only be a 10% water change