Looking to upgrade my wave-maker. Any recommendations for a 75 gallon tank?

Also, looking for more rocks in good prices? Any tips or suggestions thank you!!

Literally new! This is my 75G Saltwater tank! Trying to learn as I go.

Jump into it with 0 knowledge to make happy one of my kiddos and I have fallen in love with it.

As you can see I don’t have the best set up or equipment but saving to get it soon and to upgrade to a bigger tank and add corals eventually. About 5 months in, everything have been stable with couple water changes here and there to keep up the good health.

Any feedback or advance is welcome!

(I know about starfish but my wife got them for the kiddos and we try to relocate them and my kids cry so much)