Thanks. Is there anything else that will serve the same purpose besides a shrimp? Maybe a frog or crayfish?

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Tank one: 60g acrylic

1 green terror cichlid
1 jewel cichlid
1 jack dempsey cichlid
1 orange lab cichlid
2 yellow lab cichlids
1 kissing gourami
2 glass cats
1 bristle nose pleco
1 golden mystery snail

Tank two: 55g glass (taking care of this one for a friend temporarily)

2 huge Oscars
1 large Jack dempsey