I'm after some advice as I'm running out of options and loosing fish. I'm running an Aquamedic Blenny standard setup with a Radion XR30, MP10 which has been running since November 11. There's Live rock and a mixture of corals which are all thriving and doing well.
After cycling, I originally stocked with two common clowns, 6 line wrass and two scooter blennys. Over the course of a few months the fish started to die off, the clowns showed some signs of whitespot which was treated with nt labs marine treatment, this brought them back to life and cleared it up really well. Then the other fish died over a couple of days and after a few weeks one of the clowns disappeared completely (not jumped) the other got it's white spot back and later died. I re-treated the tank and left it without any live stock for a couple of weeks carrying out my weekly 20% water changes.
Since then, I've recently introduced a single domino, from a completely different supplier who source their fish from a different wholesaler as someone suggested supplier could the problem. This has now, after a few days, developed white spot!
The most puzzling part is my water has been tested by myself religiously (two different test kits) with all results coming back spot on, the odd PH buffer is needed from time to time but nothing major. I've had two independent LFS test all parameters who have also found nothing to be wrong with the water quality.
I'm feeding a mixture of frozen and pellet base food.
Other points to note; I've never lost a coral and these range from the hardy Zoas to Australian Spider Sponges, Dendrophyllia, Acropora's and xenias. They are all growing and looking very healthy. I also have a bubble tip in there, perhaps introduced too early to an immature tank but it was given to me by someone who had to shut down. It's also doing well, growing and eating. For me the anemone should be the first to go if water quality be an issue.
Any ideas, from you guys would be much appreciated as I've run out of options other than having a fish free reef :|