I would not trust any automatic alk controller to control my alk. Every automatic alk tester on the market are toy/hobby grade. They all will drift after few months of use. I have alktronic and mastertronic but I still test with hanna to confirm before adjusting my dosage.
No fish will school in a confine space such as our tiny tanks. They may shoal, not school.
I have 4 firefish, and 7 anthias in a 150g tank. Everyone have their own spot to stay in.