| pictures help to shorten the distance from help
As I re-read the initial post, to again understand what facilities we were dealing with, it struck me that the nitrates were very high and that a 20% water change would have dealt with it. Except with no bottom drain, I'm afraid the fish ( and those trying to help solve the situation ) are dealing with something less than pristine conditions of water along the bottom. While we're making recomendations to help we need to be reassured that the water
along the bottom is being directly targeted for removal or the water changes will not have the impact needed to arrest the situation. Of course the eventual cure will be to place a bottom drain(s) in the liner and to get information on the type or filter and turnover rate. But for now, in order to stop the bleeding, we need to know that the water replacement effort is being done correctly. During water changes the salt levels will need to be monitored and re-adjusted back to recomended levels.
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