ph going down in d.w.c

[bhicks]

hello all
well im stumped iv got a plant in a dwc 20ltr is all going well but the ph is going down (not up ) . now iv seen on the net something that says i need to up feed if ph goes down .or was it take feed out .lol
so if any one can help ...... :thumbsup:

One more quick point - ~5 gallons of water is usually not enough to 'hold', or stabilize the PH - i.e. you're more likely to see drift the less water you have. Using 25-30 gallons, we see a drift of one or two 0.x every 1-3 days. When we were using 15-20 gallon res. we saw 2 to 5 0.x drift every day or two, and when we were using a 75 gallon res we'd only see maybe 1 0.x drift a week.