You're getting quite a collection there !
To track down your old posts:
Goto the Forum Index page, click on the "View your Posts" link, in the upper right corner.
or
Press your Profile button, under your Post. Then press the "Find all posts by nikitanain" link.
or
Click on your name in the Member list, or Index, or any other list, then click on the "Find all posts by nikitanain" link.
The 'Search' function is not too bad either, particularly when you have heaps of posts.
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Angels, Black Mollies, Bristlenose', Clown Loaches, Cory Aeneus, Gibby, Guppies, Hockey-stick Tetras, Keyhole Cichlids, Otocinclus.