[shellsea]

DNA I also thank you for all your efforts and hard work in helping us all control these beasts. I have read all or most of the posts here. If I am correct you feel that the presence of the dino's in the tank is primarily caused by iron in the GFO or in some other form.
I have been battling the dinos for some time. Never did the scope thing to see what type but they are. They don't show in the sandbed until lights have been on for a few hours being my main identifier. I have had mild success using DINOX and other chemical additives but they clear up and return soon after. I do not use GFO anymore. So what could be the source of iron fueling the dinos? Your thoughts are welcomed.