So my 2g had been running fine for a while but has now exploded with brown water/some sludge on plants. It started off getting milky and then turned brown (distinctly brown, doesn't look like Green Water). I've been using Flourish, Excel and DIY Co2 (hagen canister). Firstly, i think i was using too much CO2, using the full Hagen DIY recipe from this board. Then my canister got knocked over and the CO2 brew was pumping into the tank, could that alone have caused the brown water? The other thing i was thinking-i read a bit about silicates in sand causing algae. I had been using river sand fine since June on a one gal but when i switched to a two gal a month ago, i needed a bit more sand so i bought a little pouch of that sand used for Hermit Crabs. So, is it from the Co2 brew and i should just wait it out or should i get all new sand? Any insight would be much appreciated...