水草情迷

20x13x13吋缸平時水質保持在6.5PH上下，但開了8小時co2一秒一泡，PH會去到差不多5這樣是否正常，雖然第二天會回復到在6.5PH上下，但這樣的PH變化對魚'草有否應，我知co2會令水質變酸如果再減co2會否不夠給水草給收呢！請指教謝謝。

CO2 injection in aquariums will let your water to be more acidic
when mix with water will make carbonic acid - Plants absorb it for their nutrition and growth, the carbon being retained and the oxygen given out.

for your reference
http://www.theaquariumwiki.com/Carbon_dioxide
http://www.theaquariumwiki.com/Carbonic_acid

我諗每個case都唔同，沒有必行秘笈，慢慢慢慢調，找到合適點，得到成果，這才是當中樂趣。

_________________
http://crsfunland.blogspot.com

your PH variation seem a bit too large not good for fish. But... afterall your own observation would decide better. if your fish is well. no need to change lar. I usually prefer 24x7 Co2 but try keep it steady. I may reduce CO2 to every 2 sec 1 bubble but turn it on 24 hours and observe for some time.