That 1st pic, is one of the harder softies to take care of and the general rule of thumb is that they should only be tried by the advanced aquarist. As well as needing a very strong in alot of cases direcet current from a powerhead.
As for the second pic almost equally beautifull and almost equally difficult to keep, and again should only be taken on by the advanced reefer/aquarist.
I think youll find from reading and testimony that people have alot more success rates with encrusting sponges which are very beautifull in there own right.
Those particular species in your pictures are very unforgiving of poor water quality. You definately have enough for mushrooms, but a
leather coral would be pushing it and maybe to much to chance. Maybe a flower anenome? Mine did pretty well with a lower amount of light.
But if your confident that you can maintain consistent water quality then of course the decision is yours . But those typically are discouraged because of fatality rates.