What type of material is the tank and the rear chamber?
Tek, no fish at all. Will throw my low nutrients off.
My temp issue is about how temp but low. Tank reaches 26.6 highest during the day but at night drops to 23.5 or 24.5. I'm using a 150watt heater and its nit coping with 20l but used the same heater on my 200l drop reef and never had temps dropping below 24.5.

