Who Gives A Fish Forums

Introduce floating plants that outcompete duckweed, like Water Lettuce or Frogbit. Their larger leaves block light and roots absorb nutrients faster. Works in my 40 gallon with CO2 injection.

Data beats guesses. Log your settings and coral responses. I track color, polyp extension, and growth weekly. Found my sweet spot after 3 months of tweaks. Now I only adjust for new additions.

I'll keep doing the water changes then.
I've got an auto water change setup from a rain barrel, but the auto top off is still from the mains supply. If I can work out the daily evaporation loss, I can set the auto water change to replace double that amount with rainwater, that should give me a good ...

1300l dirt/sand planted tank here, 150l sump.
My tap water's a real challenge - PH 7.8/8, KH11, GH20.
I'm trying to avoid another RO unit, so I've been using collected rainwater to hit my target of PH 6-7, KH 2-4, GH 4-6.

I've been doing water changes for a few days now, and I've managed to bring ...