what can be next to what?

[tlo]

As a general guideline
-sps is usually okay next to other sps.
-most lps have sweeper tenticles that extend, stinging other corals, so lps need quite a bit of room around each coral. Depending on the species, some can be several inches longer than the tenticles.
-mushrooms/ricordia/yuma often release chemicals that are damaging to lps and sps especially - so you need to run carbon and not have them too close to the other corals