| 2025-12-31 | Bloom that's green |
| 2025-11-17 | Growth in a fish tank |
| 2025-07-06 | Unwanted growth in fish tanks |
| 2025-05-16 | Pool owner's problem |
| 2023-05-02 | Pond buildup |
| 2023-03-15 | Buildup of tanks? |
| 2022-09-18 | Fish tank buildup |
| 2022-01-29 | Growth from stagnation |
| 2021-10-05 | Pond scum, typically |
| 2021-05-18 | Fish tank buildup |
| 2020-01-14 | Aquarium buildup |
| 2019-11-25 | Tiny pond plants |
| 2019-05-26 | Fish tank film |
| 2018-12-17 | Seaweed, e.g. |
| 2018-09-21 | Growth on buoys |
| 2018-05-14 | Fish tank gunk |
| 2018-04-03 | Fish tank buildup |
| 2017-12-18 | Aquarium buildup |
| 2017-07-31 | Fish tank buildup |
| 2017-03-20 | Simple pond life |
| 2016-03-14 | Organisms that cause red tide |
| 2014-06-17 | Pond growth |
| 2014-04-24 | Food for tadpoles |
| 2013-08-22 | Deterrent to swimming |
| 2013-07-21 | Phycologist's study |
| 2012-09-02 | Tank top? |
| 2012-06-03 | Biofuel source |
| 2011-05-24 | Seaweed, e.g. |
| 2010-06-08 | Pond buildup |
| 2010-05-28 | Potential pond poisoner |
| 2009-12-16 | Fish tank buildup |
| 2009-04-18 | Red ___ |
| 2008-02-29 | Pool owner's nuisance |
| 2008-02-18 | Aquatic plant life |
| 2007-02-25 | Aquarium buildup |
| 2007-01-18 | Aquarium problem |
| 2006-09-25 | Tiny pond plants |
| 2005-11-03 | Pool problem |
| 2004-07-31 | It may fill up your tank |
| 2004-05-03 | Pond buildup |
| 2004-01-26 | Pond growths |
| 2003-09-28 | Plankton components |
| 2003-07-28 | Pond buildup |
| 2002-02-15 | Plankton, in part |
| 2001-04-25 | Pond cover |
| 2000-09-18 | Low end of the food chain |
| 2000-05-08 | Seaweed |
| 2000-04-15 | Frog spit |
| 2000-02-27 | Tank buildup |
| 2000-02-17 | With fungi, they form lichens |
| 1999-10-10 | Certain thallophytes |
| 1999-07-10 | Sea drifters? |
| 1998-10-17 | Pool problem |
| 1998-05-31 | Basis of the marine food chain |
| 1997-12-16 | Lake life |
| 1997-11-03 | Pond covering |
| 1997-09-17 | Swimming pool problem |
| 1997-08-23 | Sign of stagnation |
| 1997-07-30 | Pool owner's headache |
| 1995-12-19 | Pond cover |
| 1995-08-30 | Tiny hydrophytes |
| 1995-01-01 | Plankton components |
| 1994-11-23 | Pond film |
| 1994-09-11 | Fish food |
| 1994-08-14 | Spirogyras |