Thanx, it is the Canon Powershot SD 870 IS.
By no stretch of the imagination am I good with it. Just got it and still learning the ins and outs. It does have an aquarium mode though. One of the reasons I picked that model.
On the Halemida, I think it is one of the more safe macros, like Coralline it is a calcacerous type algae. So if you can keep Coralline I believe keeping Halemida should not be too hard. I understand your concern though, once bitten - twice shy.........