I have 2 toilets that bubble / gurgle a lot whenever we run the water in my sinks or showers. It happened about 6 months ago & then stopped for a while & now it is back & happens all the time now - Also, it is not just the toilet that is closest to the water running that gurgles - I know when my husband is upstairs showering b.c the toilet in my family room downstairs goes crazy with bubbles & gurgling sounds & vice versa - the toilet & bathtub upstairs gurgle when the water is running in the kitchen or in that bathroom. PLEASE HELP - we have a septic tank & are on well water - is it linked to them?:confused:

It is more likely your vent stack than anything else. Gurgling is a fixture trying to vent itself because the stack is plugged. Rod the stack from the roof if its safe to get up there. Rod to the basement floor and about 15" more using a 1/2" snake.