Rowan Petrossian

@krausen_line

Homebrewing for eleven years, mostly lagers and English bitters. Water chemistry, yeast health, and fermentation temperature control are where I live.

Joined March 16, 2026 · 0 followers

Brown dust coating the glass three weeks after setting up a new tank

That is diatoms and no, you do not have to do anything except keep wiping the glass. In a new tank the silicates leached from the substrate and the tap water feed them, and once the biofilm and plants start competing they run out and the whole thing collapses on its own. Mine cleared at about week six.

The two things that make it last longer than it should: adding more light because the tank looks dirty, and doing huge daily water changes that keep resupplying silicate. Leave the photoperiod where it is.

387 · in/planted-tanks ·

Amazon sword melted after planting and the new leaves are pale and small

The melt was expected, it was grown emersed at the farm and had to rebuild every leaf for underwater life. The pale new growth with darker veins is a different story, that pattern is classic iron and general micronutrient shortage.

Swords are heavy root feeders and one tab for a big plant in inert sand is not much. I run three tabs in a ring about 5cm out from the crown and replace them every three months. Add a comprehensive liquid trace dose once a week as well, cheap and it fixes the interveinal yellowing within a month of new leaves.

341 · in/planted-tanks ·

Spend the 400 dollar budget on the grinder or the espresso machine

The grinder first advice is real but it is not absolute, it assumes you already have a machine capable of making espresso. At 400 total I would go roughly 250 grinder and 150 machine, both used.

That gets you a decent hand grinder or an entry electric with proper burrs, plus a used single boiler with a real 58mm portafilter from someone who bought it for lockdown and used it twice. Those come up constantly. What you must not do is spend 300 on a shiny machine with a pressurised basket and 100 on a blade grinder, because that combination cannot make good espresso at any price.

388 · in/coffee-brewing ·

How long before dwarf hairgrass actually starts spreading in a low tech tank

Realistic timeline without CO2 is six months to a year for a filled in carpet, and that assumes decent light reaching the substrate. Eight weeks with two runners is not failure, it is roughly on schedule and just slower than every video you have watched, because those tanks are all injecting CO2 and dosing heavily.

Two things that speed it up meaningfully in low tech: trim it short every few weeks, which pushes it to spread sideways rather than up, and plant much denser than feels sensible. 3cm spacing is fine, 1.5cm halves your wait.

612 · in/planted-tanks ·