Keep or Kill?

Hi all well this morning I found the red crab dead on my sand, so for what I know I’m crab free in my DT.
The rest of them are in de sump waiting their verdict, so far I’m thinking on leaving the crab there looks happy eating from the RDSB and maybe the mantis to or if it gets bigger go for the nano for it, it’s a very cool and interesting little animal just to get rid of it.
For the pistols shrimps I’m thinking on move them back to the DT, they are ½” or even smaller and it look that’s their full grownup size so I don’t think they will attack or try to eat any fish.
So any idea here would be very appreciate.
And now for the bugs, they are my mainly concern, I did kill the 2 u se in the picture, but I was thinking on going this weekend and buy my first inhabitants was thinking on getting 2 clowns and maybe a blenny, but now I’m doubting on doing it, if I have more of these Isopod, they will kill my first fish.
For what it can help, yesterday a made a 50% water change, changed my DT sand that was cilice sand with some aragonite (so there isn’t any chance of these bugs being in the sand) and did give all of my LR a 5 min RO water dip and that’s how I catch all of these hitchers, now I did all of these just to get ready for the new fish, now I don’t know what to do :( any ideas?
 
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