Reddit reviews BohoFarm Heat Mat Thermostat Controller Digital Heating Mat Thermostat for Reptile/Germination/Rooting 68-108℉

I just got a young Leopard Gecko about a week and a half ago. He was eating consistently up until 3 days ago. I have him in a 30 inch 20 gallon tank with a Zoo-Med under tank heater + coconut fiber.
I was using a red 100 watt heat light for the first week, but realized that was probably overkill. I now have a 12 watt white UVB light in there, but the temperatures haven't managed to stay consistent like they had. I think that's why he's not eating?

I purchased a heat mat thermostat ( https://www.amazon.com/dp/B07LBGWMV9/ref=cm_sw_r_cp_awdb_t1_poPIDb1DAT35P ) but despite setting it to 90-94, I haven't gotten a temperature reading above 80 Fahrenheit. The day after I made the change, he started ignoring any mealworms or crickets I stuck in his tank.

Should I buy a new thermostat or higher output white light? Does he just need more time to adjust? His tail is thinning a bit and it has me worried. Thank you guys in advanced, this is my first lizard and I want to make sure it has the best life it can

Depending on the time of year you could make such a better setup yourself for a either a little cheaper or more or less the same price. Here's a little shopping list, some points have reasons by them.

• PetCo's 20 Gal Long Aquarium
  
  • During certain times of year you'll be able to get this in a sale called the Dollar Per Gallon sale. It'll be worth-while to DM them on Twitter and ask when it'll become available for your state.
    
  • Price: $39.99 + $13.00 for the lid. Sale Price: $20.00 + $13.00 for the lid. --- $33.00
    
• 11"x11" UTH/Heat Mat.
  
  • A heat pad is crucial piece of your enclosure as it'll make it super easy for your little friend to get his stomach to the necessary temperature to digest food - (90F). for $10.00 this seems like an adequate purchase.
    
  • Price: $9.56
    
• Thermostat
  
  • A thermostat is mandatory. You will need one whether you go down the light route or the heat-mat route. You'll use the probe on this device to stop the heat mat from exceeding 90F as much higher may cause significant burns.
    
  • Price: $16.59
    
• 3 Hides. Cool Hide | Humid Hide | Hot Hide
  
  • 3 Hides is the recommended minimum. Humid hide should be half-on the heating pad in order to raise humidity. This is easily achievable with a 20 gal-long... much harder with a 10 gal.
    
  • Price: $30-50
    
• Supplements -> Multivitamin | Calcium + D3
  
  • These two supplements are mandatory. Both will last you atleast half of the reptiles life time. I ordered 500g of Calcium powder to be used between my three Geckos and I've not even touched the surface in 3 years.
    
  • Price: $25.00
    
    Decor/Plants/Bowls can be added if and when necessary. Substrate can be of your choice, as this is your sons reptile I'd avoid the loose-route for now. This brings our grand total to, roughly, $114.59 - Preshipping at the cheapest route. You can knock a few dollars off of this if you manage to find some cheaper hides and cheaper supplements. Since I'm in the UK I couldn't find the products that I'd normally use as supplements, ours are a lot cheaper - seemingly.
    
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    If you need any more help/advice you're more than welcome to reply or PM me.

Substrate that holds humidity well

(2 Pack) Zoo Med Eco Earth Bricks https://www.amazon.com/dp/B01MUGYCL0?ref=ppx_pop_mob_ap_share

Heat pad

Zoo Med ReptiTherm Under Tank... https://www.amazon.com/dp/B0002AQCKA?ref=ppx_pop_mob_ap_share

Heat mat thermostat and controller

BoHoFarm Heat Mat Thermostat... https://www.amazon.com/dp/B07LBGWMV9?ref=ppx_pop_mob_ap_share

Thermometer and humidity gauge

Zoo Med Labs Digital Thermometer... https://www.amazon.com/dp/B06XY3X7P9?ref=ppx_pop_mob_ap_share

Make sure you read the instructions on every item, but these will allow you to create the best habitat for your ball python :).
Remember that a water bowl and at least one hide that is placed over the hot spot are needed as well. They’re not climbing snakes so something for them to climb isn’t necessary, but isn’t a bad idea for exercise and aesthetics. Let me know if you have any other questions!!

I'm not sure what wattage you'd need as I don't use them for my BPs but here is what you'll want to look for: https://www.amazon.com/Flukers-Ceramic-Heat-Emitter-Reptiles/dp/B0002DHO6I?th=1&psc=1
I would suggest combining any heating element (including the heating pad) with a thermostat to prevent burning your animal. Here is the one I use for single cages: https://www.amazon.com/BoHoFarm-Thermostat-Controller-Digital-Germination/dp/B07LBGWMV9/ref=mp_s_a_1_5?adgrpid=58774470711&gclid=CjwKCAjw0vTtBRBREiwA3URt7in9YoKI4q6yMVOkdGir5PdmSgbb8jaPffbDzHsaw0OerjDYrTG5fhoCzSAQAvD_BwE&hvadid=274680356553&hvdev=m&hvlocphy=9028317&hvnetw=g&hvpos=1t1&hvqmt=e&hvrand=1542334422605610034&hvtargid=kwd-303301745743&hydadcr=5603_9612393&keywords=thermostat+reptile&qid=1572715745&sr=8-5