I am new as well, but to the best of my understanding most of aquacomputer's aRGB is designed to be managed by the aquasuite. MSI center and other hardware vendor made management will be hit and miss, with more misses then not. I would suggest looking into a standalone aRGB service if you have more then one vendor. I know SignalRGB has added aquacomputer D5 NEXT pump and highflow NEXT. I'm not a fan of a subscription model but they have been super good about support. If open source is more you speed, OpenRGB doesn't support any aquacomputer lighting at the moment; but if you are willing to put in the work open source is good for a reason. OpenRGB is also lower resource hungry then SignalRGB.
The biggest problem with getting the aRGB on the LEAKSHIELD to work is on the aquasuite side. There doesn't seem to be a way to pass-through aRGB data for the LS. I can get the highflow and D5 pump I'm running to be found by SingalRGB after tweaking some settings and ending aquasuite's servace (this does limit aquasuite monitoring and software alarms). But the LEAKSHIELD doesn't have the options in settings. I am trying to find the correct place to message auquacomputer about this right now. That and translate my question into German.