12-07-2009, 12:53 PM
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My concern would be for the clown loaches. These are large fish and will continue to grow to 12 inches or more, if properly maintained. An aquarium of 6 feet by 2 feet by 2 feet is deemed necessary for a group of these fish, and being social they must be in a group. Three works fine, five would be better, but not in a 55g or even a 90g or 110g. There is simply not enough room for the fish to grow healthily.
Here's a good info site on this wonderful species: Clown Loach (Chromobotia macracanthus) — Loaches Online
Unlike humans, fish continue to "grow" all their lives, internally and outwardly. It is therefore important to provide the necessary room at all stages. Fish growth is affected by the water volume. The physical size obviously has a bearing on this, but there is also the issue of water quality. The larger the aquarium the more stable the water quality because it is not being polluted as quickly as a small volume with the same fish. For example, the well-known and highly respected discus authority Jack Whattley has written of experiments with discus raised in small tanks and large tanks. Discus fry in larger tanks receiving the customary 50% water change each day grew healthy and vigorous. Discus fry were also raised in smaller tanks which were given a 100% water change five times each day, and the fry grew healthy and vigorously. These and other tests indicated to Mr. Whattley and others that water quality is as important as physical size. Maintaining potentially large fish in small quarters even when young has been demonstrated to result in stunting, whereby the fish cannot develop properly because of the limitations forced upon it, and future health issues result.