I'm noticing different commands behave differently in different rooms. "Get water" has a very long explanation in the hidden chamber, a "you can't get that" by the pond, and in the room with the tanks the game doesn't seem to register that there's water there at all.
As a result, I am a little stuck! I am at 23/32, I have the cover ("lid" would be a good synonym to add, especially because cover is a verb as well as a noun and I am not sure if that is fooling the parser) and the radioactive fish. I understand that I need to wash the fish, but:
1) I have tried a large number of commands to use the empty sink. I have tried looking for taps, use sink, fill sink, run water. I even tried using the cover as a substitute dish thinking that this might trick the sink into thinking it was dishwashing time, so that it would fill up. The parser did not recognize a lot of these commands, but I gather that the sink isn't working.
2) Since I can't wash the fish directly in the pond, I want to take some pond water elsewhere. My idea is to get some of the water, but all I have is the cover. I want to scoop the pond water out with the cover, kind of petri-dish style, to move the algae to another body of water, like the fish tank or the gemstone pool.
A way to inject hints might be to implement an "ask about" function with Audrey. I have no clue what to do with this cover, to be honest. Also, "call audrey" might be a good synonym for "use computer".