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The problem you report is probably tearing caused by the video card updating its memory in the middle of a scan. It should be even more noticeable if you scroll faster with the arrow keys. Most cards have a setting in their Display Properties sheet to eliminate this (at the cost of frames-per-second). It's usually called "Vsync" or "Wait for Vblank" or somesuch.
Re: the anemone - Yes, the one on the far right is where the clownfish are planned. The green carpet may be home to other fish, as it's extremely easy to have them hang out there (no moving "fingers" to deal with).
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