Originally Posted by POLARBEAR0871
The clowns had a weird disease there weren't really any symptoms except this clear slim that covered them it started with my damsel and then progressed onto four clowns one being a Picasso (I was not happy) I later found out it was a disease that usually only clowns and damsels get I forgot the name of it. My tank is completely all natural I have no filter in the tank at all I use just rock as my filter in the tank and a power head for current everything else I leave to the rock to do.
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it was probably brookinella disease.
if all you rely on for filtration is the live rock, well there is 85% of your problem right there, especially if you removed some.
Regardless of all the Swiss/German hoopla, an enclosed ecosystem like your tank needs more than just some rock with bacteria in it, unless you keep the bio-load very, very light, IMHO
if you have no skimmer or filtration than you are not removing enough waste from your system and I have real doubts about just how much of a bio-load your system can maintain.
The problem with running a system as you are is you only have a razors thin margin of error before things go south.
I would venture a guess that your removing some of the live rock initiated a cascade of poor water quality, stressed the fish and suppressed their immune system and they succumbed to disease.
I always go with a filtration scheme that can manage double the bio-load I intend to have.