R2R Secret Santa Gift Guide POST gift suggestions

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Any Suggestions ? these should be reasonably priced things most could use and most likely dont or you purchase frequently.
I'll start

Frag Kits-(tools)
Frag glue grenade (25) count
PH or salinity tester/pen....OH thermometer
Beakers or graduated cylinder

 

[Katrina71]

Tank towels

 

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