Hi guys I've got some questions about playing preflop against fishes :)

My question is how would you adapt your opening range in the follow situations (100BB effective stack, fish = loose passive player, all other positions play solid poker nothing out of line):
- We are in the CO and the BU is a fish. Should we go looser (try to isolate the fish with a raise) or should we go tighter (because the BU will flat call a ton of hands and give the blinds a good opportunity to see the flop for a better price or 3betting more to extract more value)?
- We are in the BU and in the SB is a fish. Should we increase our open-raise range (to isolate the fish) or our open-limp range (to see with more hands a flop)? And how would you adjust when the Fish is in the BB?
- At the end in addition a general question. If we are sitting on a table full of fishes how would you adjust our opening ranges in the different positions? My idea:
EP: tighter than my standard opening (because they will flat a ton of hands and we often have to play postflop in a multiway pot OOP with a too wide range)
MP, HJ, CO: tighter than my standard opening but adapting not so strong than in EP
BU, SB: looser (because we want to increase our chance to play IP against 1 or 2 fishes to abstract money postflop)

Thank you for any answer
I can’t find the right solutions…