Can I use a regular attack and Aqua Diffuser/Magma Pointer as well, for a total of two attacks on the same turn?
No, you cannot. The text just means that you also have this attack available as a choice for your one attack for the turn.
Source: TPCi Rules Team (2015-04-23)

Relevant cards

Note: All applicable cards may not be listed below.
DC1_23
DC1_24