Ladies & Gentlmen,
Thanks for all the responses to my algae issue. As usual, without any knowledge about a problem you are at the mercy of the dealer selling his product.
TRUCKWEST in Fountain CO recommended "KILLEM". Read the instructions carefully, it's 2.3 oz to 1000 gallon of fuel. (powerful stuff). I tanked to the max, gave it a shot and off we went. I pulled the fuel/water seperator that evening. A bit of black stuff came out. Shook the container, a little more.
Reloaded the filter, topped of the tank, topped the fuel, re-shocked with "KILLEM". Nice smooth ride, no hiccups.
Was glad to see no one had to purge their tank(s) in order to cure the problem.
As always, thank to the RV"ers and members of "iRV2" for their wisdom and willingnes to share.
Norm & Anne-Marie