



Renovation of a School Fish Tank
Hello dear community,
I don't know if this is the right place, but I'd like to tap into Reddit's collective wisdom.
At my school there's a 2.5m x 0.6m x 0.6m aquarium (see picture), which so far has mainly been maintained by the janitorial team. At the moment, this aquarium only contains three clown loaches, one rainbowfish, and some stunted Vallisneria. Oh, and quite strong algae growth. The aquarium has a separate filter system in the basement, which is fairly large but, in my opinion, relatively primitive (just filter mats in two or three densities).
Now it's your turn, because I trust neither my own judgment nor that of AI. I'm not an aquarium expert, but I'd like to beautify and enliven the aquarium together with my students. My goal is to bring the aquarium more into balance. Right now, among other things, algae eaters and more plants are missing to counter the algae growth. The algae eaters are the biggest problem here, since the classics (snails and shrimp) get eaten by both the harlequin rasbora and the loaches. Both fish species are also shoaling fish and would accordingly need more individuals. Additionally, a better filter system could be discussed. The water parameters are currently fine (nitrate, nitrite, ammonium). I suspect a bit of a phosphate deficiency, based on the struggling plants (they definitely aren't being fertilized). Also, according to a colleague, some of the algae are quite undesirable [species].
From my perspective, the following options arise for upgrading the aquarium:
Option 1: Keep almost everything as it is
- Replant the aquarium (including fertilizing where necessary)
- More Vallisneria
- Java moss
- Salvinia and frogbit
- Add 2–3 more clown loaches (to make it a proper shoal)
- I would try to give away the harlequin rasboras (the alternative would be to add more of them too, but that might create a space problem)
- Maybe 1–2 bristlenose/otocinclus catfish as algae eaters
- Claude also recommends trumpet/Malaysian livebearing snails to me. It says they reproduce quickly enough that the loaches and harlequins can't keep up with eating them.
Option 2: Redesign
- To get rid of some of the algae, the fish would need to be temporarily relocated (maybe to the filter tank) and the actual aquarium emptied and scrubbed clean
- After that, one could proceed similarly to Option 1
Option 3: Start completely fresh
- Give away the fish and redesign the aquarium from scratch
- Among other things, this would allow the introduction of shrimp and snails
- Gives full freedom to design everything however one wants
TL;DR: What would you do if you had a 2.5m x 0.6m x 0.6m aquarium at your disposal?