Hi

I have a 27Gal freshwater and

2 banjo catfish
1 yoyo loach (he ate all but 1 snail)
1 common pleco
1 red pleco(he's not red at all but the LFS insisted it is a red pleco)
3 zebra danio
3 pristella
2 rummynose
6 neon tetra
1 betta male

and some plants(no idea what are they)...

Can I add a bit of salt? Ocean salt or what? I want to "keep the doctor
away" and I want too add 2 fiddler crabs. Or I just add the crabs without
salt? Lfs told me the fiddler crabs should be ok in freshwater but I want to
hear more opinions.

TIA

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------Splitskull-----