Kinda a typical passive 1/2 100 e stacks,...4 limpers in front of me and I limp q10o on the button. I feel like this is a leak of mine, to limp these kind of q10 k10 hands in lo after limps. Say the stacks were 100 or 150bb deep, does that change it to a call for any of you if you do fold? Or what about if mega fish post flop limp in front, do you limp just to be 8n the pot with them deep?

Im a super nit pre and even I limp with those hands in position. If I was in MP with 2 limpers behind I wouldn't but BTN/CO JTo type stuff is fine as long as there are a weak player or 2 already in the hand.

At a loose passive table it can't hurt too much to limp along with middling hands when in position. You have to be a bit clever at navigating boards and realising when your top pair ten kicker is no good but a button limp here is probably +EV.

However, why not raise? It has many benefits. Gives you initiative to go with your position, uncaps your range so its tougher to put you on exactly what you have, will usually allow you to take a free turn card if you want one and makes the pot bigger for when you hit the flop hard.

Never folding this. Limping seems perfectly fine, but I would not raise here when stacks are only 50bb, due to RIO vs commitment issues.

That is about the bottom of my limping range given 50BB stacks. With shorter stacks I would fold. With stacks 75BB+ I'm usually limping. Adjust a bit for how likely the blinds are too squeeze. At 100BB+ also consider squeezing sometimes but that depends on table conditions, 1/2 players tend to be limp/call happy so I don't squeeze very often.

Having a mega-fish or whale at the table does change things. With those sorts of targets you will want to adjust your entire strategy a bit to target them. But the best way to target them varies. For example, if they get sticky post flop then I'm more inclined to limp and extract value post flop. If they are the sort that plays 100% of hands preflop but is fit/fold post then raising to isolate looks better.