I did ask Reef Workshop about dosing NO2/PO4 Symbio, Anti-cyano Symbio and Bacto-Symbio at the same time. Asked if I should adjust the dosage or anything. Here is their reply.
Figured I should give an update. It has taken about 6 weeks on the bacteria to eradicate the Cynao in my 75g tank. I made no other changes other than adding the bacteria from those 3 and also carbon doseing. I have a 40g that got cyano issues about the same time as the 75g. I started the 40g on carbon dosing and some other products to try to bring my No/Po down. That 40 is still covered in cyano. I have not been able to bring my No3/Po4 numbers down in my 75g. Its still a battle like on the 40. But the cyano is gone from the 75. So I will say it worked. It took 6 weeks to eradicate the cyano. Now that that test is done I am going to work on bringing the No/Po under control.