11-11-2009, 12:25 PM
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Diatoms (brown algae) are common in new tanks, though sometimes they don't appear; I've had it both ways. Thinking back, when I have used large plants from an existing tank to plant the new tank, and added fish the first day, I have never had diatoms. But in brand new tanks with new (small) plants, I have. It should disappear after the first round. It can also occur in low light and with excess of silicates (minerals). I wouldn't buy a fish just to handle this, as it will be gone (assuming your maintenance and stocking is balanced) and you haven't room for more fish as others have noted.
Which brings me to a more serious matter: your statement that there is plenty of room now until they mature. This is not actually true. Keeping a potentially large fish in a small tank frequently does affect its growth. But this is not a benign process that creates a perfect miniature version of the fish. It is termed "stunting."
Fish growth is affected by a number of different things, and one of these is water volume or tank size; this has two impacts, water quality and actual space for the fish to properly develop. As a fish grows, the internal organs develop towards the adult fish. During this process, if the fish is confined to a small tank for its adult size, the growth rate is affected. Health problems arise. Most commonly this affects the immune system which can lead to other problems down the road. Behavioural problems are common when the fish is growing in an unsuitable environment.
Aside from very short-term tanks for fry, fish should always be housed in an aquarium that will provide the requirements of the particular species when adult. This is a good way to ensure proper development and that means healthier fish.