I always tip 50 pesos per tank. I ask the DM if they split it with the boat crew because some do not. Last dive trip I tipped the boat capt 50 pesos and the DM 50 every day and was treated like a king.
I prefer to tip in local currency as it is easier for them to spend.
I also tip,
10 pesos to the guy at the airport who wants to take my luggage
20 pesos to the bus driver
10 pesos each day to the room cleaner (may not be the same cleaner every day so I do not wait until the end of the week)
10 to 100 pesos per evening to the girl who brings me drinks in the bar
20 to 100 pesos per day to the bartender if I am at the beach bar.
I am not rich but I can afford this for a week vacation and it makes a difference to the lives of the people there. And it can make a BIG difference in the service you get.
I agree, but I don't tip that guy until I get my luggage back