I currently have a 125 and will be getting a 75 to move some fish over to the 75.
I also plan on moving 1 of my 3 emperor 400 over to the 75. I got new pea gravel from Lowes and will probably siphon 20-30 gallons of the current water from the 125 to the 75.
Now do I still need a bacteria starter or will I be safe with the test levels?

I also plan on moving 1 of my 3 emperor 400 over to the 75. I got new pea gravel from Lowes and will probably siphon 20-30 gallons of the current water from the 125 to the 75.
Now do I still need a bacteria starter or will I be safe with the test levels?