hi,i have a heater in nft tank so the temps never drop below 20c,sometimes drifts up to around 25c when the lights are on,i have a good airstone in the res,will the plants still be able to absorb the oxygen,thanks

cant you set it on a timer to go off for a few hours while the lights are on

it only ever comes on if the temps drop below 20c

is 20c the optimum temp for a reservior?

its where roots are happiest,

j can you set the temp on your res heater ?

the forums are telling me the optimum temp is around the 18/21 mark,set the heater at 21c,see how i get on,cheers jiffa