Hi all, loving the journal threads the most, so maybe it’s nice to share my own stuff. It’s way out of my comfort zone, but hey, learning is all about doing stuff outside it, so here it goes!
People like pictures, so this is my display tank this morning.


Some specs:
As a temporary side hobby I'm developing my DIY Tank Monitor, with some devices which currently measure 24/7:

People like pictures, so this is my display tank this morning.


Some specs:
- non CO2 injected, using two Eheim 400L/h air pumps to keep the CO2 out of the depletion zone.
- non heated: 17-18 *C during the winter and up to about 26 in the summer.
- Livestock? 15x Tanichthys micagemmae and as janitors 200-300 Neocaridinas and countless snails.
- Using K1 micro as biological filtration in an in-tank DYI PVC circulation device.
- For flow: 3 flow / wave makers, total roughly 7500 L/h. And a big DYI muffled Czech air lift.
- Currently it's somewhere between 1-2 dKH, CO2 fluctuating daily between 1.2 and 2 ppm .
- water changes? every 1 or 2 weeks, 15% (= 75 liters) with RO and 5 liter tap water. The added water gets targeted nutrients: N=2.2 K=4.2 P=0.5 Ca=8.7 Mg=3.9 S=10 Cl=1.5 Na=1. Conductivity is 180 uS/cm (TDS would be 90-120 mg/L?).
- daily added tracemix 0.004 Fe as proxy.
- 2 professional grow tubes (LED 3000K, both 24 watts / 2600 lumen) and a Daytime Onex Color 40 watt, 6400 lumen. This would mean roughly 20-25 lumen/L, or medium light according to Tropica.
- Substrate-wise: 80% inert black gravel (quartz?) 2-4 mm and 20% ADA Amazonia V2 for buffer capacity and earth worm casting as substrate supplement.
- The water is still a bit hazy/ white cloudy. It's like that for a year now. I didn't use any mechanical filtration for like for 3 years, so this week I did a 24 hour test run with a pre filtered 5 micron cartridge filter, which helped tremendously. My assumption such a low stocked tank might not need it, so not sure to to progress with it.
- I might introduce a new fish species, I like Dario, which likes the temps and are no food competitors for the T. micagemmae. Not sure whether the shrimplets are safe though.
- As a self claimed 'aquatic gardener', I'm trying out some plant options in my layout. The Bolbitis is getting too big at the right wall, blocking the view too much. The back left side is still under consideration. I'm growing Pogostemon deccanensis, Limnophila aquatica and Myriophyllum matagrossense there to see which works best for me. But it might take 6 months to grow them big enough to make any conclusions. And I might swap the Ludwigia 'Mini Super Red' for Ludwigia repens for a bigger V shaped bush in the background.
As a temporary side hobby I'm developing my DIY Tank Monitor, with some devices which currently measure 24/7:
- air pump intake CO2
- CO2 and oxygen of the water via diffusion in a gas pocket (like a drop checker)
- water conductivity
- water temperature
- light intensity
- ambient air temperature and pressure
- humidity and temperature in the hood
- An upgraded pH sensor is in the making and my broken oxygen sensor is being replaced.

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