Im not sure mate i havent taken them, ill have to get a thermometre.
Yeah thats cool man, Ideally the res. should be 18 oC but the hot weather is making that figure climb significantly
I am using Asda Ice Pack to temporarily lower the temp. But I know what I need to do... And that's buy an 'Aquarium Water Chiller' ....and they retail around the £200.00 mark, you can take a chance with warm res. but if the res. temps aren't kept between 18 and 20 oC then Algae will grow, the roots can go brown and start to rott and the amount of oxegen in the water can decrease!
As far as the Winter months go, I am all sorted with Aquarium heaters to bring the Res. temps UP.....
But.....
In Summer months I really need to bring that temp down.... and I know Ice Packs are only a temporary solution.. I am also looking into insulating both my Res containers, You may find doing this helps you too!
I looked on E-Bay for both Aquarium & Hydroponic Coolers, and so far I have found nothing for less than £200.00 also the ones I have seen move 250 L per hour... and I only have 20 L total, so I am keeping my fingers crossed that someone somewhere makes smaller ones for alot less... But we'll see.
Yeah tying the branches back carefully will help reduce the overall height of the plant but its better to kinda pull the branches apart so they aren't quite as tall and more light can penetrate lower down with a greater intensity, but dont bend them to far.... How much more room do you have after the 27" and the lights at their highest point ??
Hope that helps - STELTHY