I got ice certified with a plain jane Dacor Viper. You Apex should be fine. The Sherwoods are a very good cold water reg, but I wouldn't buy one just for ice diving.
A typical ice dive around here doesn't get particularly deep. As long as the air in your tank has been properly filtered, that is dry and you remember not to prebreath your reg on the surface, you'll be fine.
Jim
A typical ice dive around here doesn't get particularly deep. As long as the air in your tank has been properly filtered, that is dry and you remember not to prebreath your reg on the surface, you'll be fine.
Jim