05-12-2009, 09:42 AM
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Originally Posted by yippee
The plans have changed slightly. I will be doing just a shoal of silver dollars in the 55, without the angels. Do they care whether they have plants, etc? I plan on doing a shoal of cories as well if i can do that. dual penguin 350s if that is good enough.
Glad you've decided to forget the angels, these would not make good tankmates in my opinion. You should be OK with a shoal (minimum 5) of Metynnis argenteus [Silver Dollar] in a 4-foot 55g tank, although authorities like Seriously Fish agree with earlier posts in this thread that adult fish require a 6-foot tank. Corys in a shoal (6 or more) will be OK, as the SD prefer the middle to upper reaches of the aquarium. Vegetable diet is essential for the Silver Dollars, some floating live plants as a food source would be good; duckweed proliferates rapidly and is apparently a favoured food of Silver Dollars; floating fern (Ceratopteris) is also a quick grower, and being tender might be welcomed as part of the diet. You can find out more at Silver Dollar (Metynnis hypsauchen) - Seriously Fish
and other sites.
The natural biotope of these fish in SA are thickly planted streams which is indicative of slower water currents; consequently, there should not be too strong a current from the filter. Not that I'm suggesting live plants (although that would be good as food) but it gives an indication that the fish do not prefer strong currents if it is not a feature of their natural environment. Good regular tank maintenance (weekly partial water change with vacuuming of the substrate) will be essential, and far more so than strong filtration. And larger fish in smaller tanks benefit more from more frequent water changes than more filtration which does nothing but move the water around. Water changes replace water with fresh, minerals, and removes nitrates.