# 360° Giant No-Filter Guppy Pond Tank 100 Days Later. How is it?

Source: https://www.youtube.com/watch?v=2V5WvJBDCX4
Recap page: https://rapidrecap.app/video/2V5WvJBDCX4
Generated: 2026-01-10T13:33:51.119+00:00

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## Quick Overview

The 360-degree, low-tech, no-filter guppy pond tank setup, reviewed 100 days later, is considered a major success by the creator, who is excited about the thriving ecosystem, especially the growth of the foreground carpeting plant Rotala and the successful integration of Pygmy Cory Catfish, despite initial minor issues like one misaligned aquarium corner and some yellowing lily pads.

**Key Points:**
- The 100-day review confirms the low-tech, no-filter guppy pond setup is the creator's favorite fish tank due to its successful ecosystem.
- The foreground carpeting plant, Rotala, grew densely, requiring significant trimming (0:56) to prevent it from overrunning the center.
- The creator added Pygmy Cory Catfish (*Corydoras pygmaeus*) (0:08, 8:58) which are thriving and showing natural behavior, using the plants for cover.
- Maintenance involved removing yellowed/holey lily pads (5:43) and trimming fast-growing stem plants like Rotala (0:57) and Cabomba (4:12) to manage light penetration to the substrate.
- A minor structural flaw was noted: one corner of the custom-built glass aquarium was slightly misaligned (2:45), though the silicone flexibility prevented leaks.
- The tank's footprint is double that of a standard 100-gallon tank, allowing for extensive planting (9:44).
- Water changes are performed using a simple siphon/hose/sponge setup (7:35) without needing chemical dechlorinators due to the established biological balance.

![Screenshot at 0:00: The initial establishing shot shows the fully planted, low-tech aquarium with significant emergent growth above the waterline, showcasing the unique pond-style design.](https://ss.rapidrecap.app/screens/2V5WvJBDCX4/00-00-00.jpg)

**Context:** The video documents the 100-day progress review of a large, custom-built, low-tech, no-filter aquarium designed to mimic a pond environment (a 'pond style setup'). The tank is heavily planted, featuring both submerged and emergent growth, and houses guppies and newly introduced Pygmy Cory Catfish. The creator evaluates the success of the initial design choices, maintenance routine, and the health of the diverse aquatic and semi-aquatic life over the three-month period.

## Detailed Analysis

The creator evaluates the 100-day progress of their large, low-tech, no-filter guppy pond tank, concluding it is their favorite tank setup so far. The ecosystem is largely successful, demonstrated by the vibrant growth of the foreground carpeting plant, Rotala, which required significant trimming (0:56) after just one week due to its rapid growth. The creator also introduced Pygmy Cory Catfish (*Corydoras pygmaeus*) (8:58), noting how naturally they explore the dense plant life, contrasting with the guppies who tend to stay near the surface. Maintenance involved routine trimming of fast-growing stem plants like Rotala and Cabomba (4:12) to prevent them from blocking light to the lower areas, and removing older, damaged lily pads (5:43). The creator discovered a minor assembly flaw in one aquarium corner (2:45) but determined the silicone's flexibility prevented any structural failure under pressure. The tank's footprint is double that of a standard 100-gallon tank, which facilitated the dense forest of aquatic plants. Water changes are straightforward, employing a siphon setup without chemical treatments due to the mature biological filtration. Overall, the creator is pleased with the tank's stability and beauty, viewing it as a perfect example of what an aquatic ecosystem should be.

### 100-Day Assessment

- The tank is the creator's favorite, thriving under low-tech, no-filter conditions
- Pygmy Cory Catfish successfully integrated and exploring the environment
- Guppies remain active near the surface.

### Plant Maintenance

- Rotala carpeting plant grew so densely it required trimming (0:57) and replanting (4:07) to open space in the center
- Cabomba needed trimming to prevent blocking light to the lily pads (4:12, 7:03).

### Inhabitants

- Pygmy Cory Catfish (*Corydoras pygmaeus*) are thriving and showing natural exploratory behavior (9:12)
- Guppies continue to populate the tank, thriving in the dense cover.

### Structural Integrity Check

- One corner of the custom glass tank was slightly misaligned during assembly (2:45), but the silicone's flexibility prevented any leaks under full water pressure (3:11).

### Maintenance Routine

- Water changes are simplified using a siphon with a sponge filter attachment (7:35) to protect small inhabitants, and no chemical dechlorinators are needed (8:02).

![Screenshot at 0:04: Top-down view highlighting the two submersible lights illuminating the dense aquatic and emergent plant life.](https://ss.rapidrecap.app/screens/2V5WvJBDCX4/00-00-04.jpg)
![Screenshot at 0:08: A Pygmy Cory Catfish \(\*Corydoras pygmaeus\*\) is introduced into the established aquatic environment.](https://ss.rapidrecap.app/screens/2V5WvJBDCX4/00-00-08.jpg)
![Screenshot at 0:32: Close-up comparison showing rapid growth of the Rotala carpeting plant just one week after planting.](https://ss.rapidrecap.app/screens/2V5WvJBDCX4/00-00-32.jpg)
![Screenshot at 1:49: A graphic card displaying the three shrimp colors discussed: Cherry \(Red\), Blue Velvet, and Yellow Sakura.](https://ss.rapidrecap.app/screens/2V5WvJBDCX4/00-01-49.jpg)
![Screenshot at 8:29: Close-up comparison showing the Fern plant mixed between healthy green growth and brown, dying sections, illustrating maintenance needs.](https://ss.rapidrecap.app/screens/2V5WvJBDCX4/00-08-29.jpg)