Cool
With the eel being such a messy eater, that could be part of the problem as far as a diatom bloom, and dirty water....you need to vacuum out that substrate once and awhile with such a messy eater, if you dont have a clean-up crew...
As far as the snails go, you should get the large ones, (Trochus/Zebra), I think the eel will have no problem eating the smaller ones...Your banded damsels "shouldnt" bother the snails..
If your water is as nasty as you say, your nitrates must be off the charts, and if that remains, you will lose the tank, and whats in it...It REALLY is improtant to keep your water clean, and your levels where they should be...Do you test the water, and if so, how often??
~Susie
