hello, just want to ask, is it possible to do triple mining? like ethash, verushash and epic using 1 miner?
yes it is, up to 4 algorithms at the same time. But if you want to mine epic, switch to verus when no epic work + mine all the time eth then the answer is no

You can dedicate for example 4 CPU threads for verus, 4 for epic and mine eth with the rest GPU's. That is possible.