Image: https://ibb.co/0VXpCcm

Here's my 4x2x2 (120x60x60 cm) PVC tank. I'm using 35W halogen and 50W DHP on dimming (probes are hanging below as on picture, both like 3 inches below bulbs). Halogen is set to be on between 7 AM and 7 PM, DHP is on between 7PM and 7AM. Both are set to 92F (33 C). My problem is that general ambient temperature is kinda high - it's around 84-85 F (29-30C). Tank holds heat like crazy. Temperature in cold hide (bottom left corner) is around 80F. Could that be caused by general very hot temperature in my area right now (heat wave in central Europe, room temperature is 78F (27 C).?? Thanks for your tips