The Planted Tank Forum - View Single Post - What heater to use in a 2.5 gallon with CRS?
View Single Post
Old 02-26-2013, 06:46 AM   #4
TwoTacoCombo
Planted Tank Obsessed
 
PTrader: (16/100%)
Join Date: Apr 2012
Location: Los Angeles, CA
Posts: 403
Default

dr fosters lists it as 7". I know in my 5gal with about 2" of substrate, the adjustment knob is just above the waterline and the bottom is just above the sand. Not sure how deep your tank is, but you can always turn them sideways. Hydor also makes an under-gravel heating system in 25W, but it's a bit pricey when you include the heat controller.
TwoTacoCombo is offline   Reply With Quote