It would have been best if you had used a false bottom and placed the pump down under the egg crate (or whatever is used for the false bottom). I have done several tanks like this and none of my pumps have failed *yet*. Most of them have been running 24/7 for over a year.
-Bill
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Updated list as of: 9/30/03
2.2.6 D. azureus
1.2.14 D. ventrimaculatus 'yellow' (16 tads in the water)
2.3 D. tinctorius 'cobalt' (one subadult)
0.0.3 D. tinctorius 'patricia'
0.0.5 D. auratus 'green/black' (tads)
0.0.3 D. imitator 'Alex Sens line' (1 week)
0.0.2 D. reticulatus (soon)
0.0.2 D auratus 'teal'(soon)