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Showing results for tags 'scum or slime'.
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I've had a bathtub pond for about 4 or 5 years now with goldfish in it. Quite successful. Moved the first goldfish out when they grew too big. It has now developed a dark slimy scum around the edges and all the vegetation has a thick brown slime on it. The plants have died back, no leaves, no flowers. The fish are still alive but not eating. All this in the last month or so. Is it normal and because of winter or should I be concerned? There's been some changes in how the whole thing operates but I won't bother going into them unless it turns out to be necessary.