04-18-2010, 07:45 PM
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In general, young pacus are pretty skittish, alone or in groups. They do grow out of it with age, but can still startle easily. Try to avoid any sharp wood or rocks in the tank, they are very powerful and can injure themselves.
You might consider some smaller active schooling fish to make them feel a little more at ease, I like giant danios for this. If the pacus are smaller than 4-5 inches, you can use zebra danios instead.
I don't think light itself is the big issue unless it is very bright, they are prob just scared in general. However, if you want to darken the tank, a good trick with 2 piece fluor hoods is to insert cut to size pieces of thin cardboard between the light and glass wherever you want a darker area. They are easy to move/remove when you desire too.
I love pacus! I have raised several over the years, they get quite a personality when they get older. My last one was like a member of the family, it broke our hearts when we gave him up
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