If you're using sterling, I know two ways to keep EDGX add liquid. first, use the ECN EDGXALID. Second, you could get you setup in the "Liquidity",just select "Allow EDGX reject orders which would result in liquidity remove", this is postonly order, if you selct this , you could not use EDGX market order any more, sometimes this is not a good choice,but for me ,it's doesn't matter , if I want a market order, NITEFAN is a better choice.
Thanx,i will speak with sterling rep.I cant click the setting to not remove liq in sterling settings because i also use edgex to peg mid point and they require it to be able to remove if needed.this may all be for nothing anyway,i think arca just raised their rebate to now be more than edgex. the life of a rebater needs to be less complicated!!!!!!!!