| In the Fishtank 5 | |
| Type: | EP |
| Artist: | Tortoise and The Ex |
| Cover: | In the Fishtank 5 - Tortoise-The Ex.jpg |
| Released: | 1999 |
| Recorded: | 1998 in the Netherlands |
| Genre: |
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| Length: | 22:43 |
| Label: | Konkurrent |
| Producer: | Zlaya Hadzic |
| Chronology: | The Ex |
| Prev Title: | Starters Alternators |
| Prev Year: | 1998 |
| Next Title: | Dizzy Spells |
| Next Year: | 2001 |
In the Fishtank 5 is a 1999 EP by Tortoise with The Ex as part of the In the Fishtank project.
Heather Phares of AllMusic writes, the "six-song EP [...] sometimes blends the bands' divergent styles into a harmonious hybrid, and other times falls victim to stylistic clashes." She singled out the track "Central Heating" as a "noisy, acquired taste". Mark Richardson of Pitchfork called the pairing of the bands "a little odd" and the resulting album "strange and probably pointless in the long run", but wrote that it "does make for a relatively intriguing listen." He noted that "on the bulk of the EP, it seems as though the Ex side of the equation presides."