I have guppies (4), 3 yoyos, 4 pandas, 1 SAE, 2 ottos, 1 dwarf gourami and some platy's. There's c02 infusion so a ph of 6.8. A long time ago I considered getting shrimp and only recall that I was afraid someone would snack on them. Can't see who in the bunch noted above. So fairly safe?