You deff need one if you have a smaller tank. I have solana 34 and I keep my wp25 on the lowest setting of 12v works great!I don't think the WP25 comes with the laptop power supply. People buy the universal power supply so that they can use a WP40 in a smaller tank with a lower voltage. WP40 runs at 28W and peak at 40W.
The pump may not even start properly with lower voltage.
Why do you even need one with WP25 anyway? WP25 runs at 8W and peak at 25W.
If you really need one, they are like $12 on Amazon.
Mine is totally silent and I have the older controller without s123. Make sure the pump isn't touching the glass there should be some space between it and the bracket that holds it inside the tank don't push it all the way in.