need a new heater what should i get

I have 2x 200 watt stealths and 2x 250 watt stealths. They work just fine.

I had problems with 2 100 watt stealths though...
 
stealth for internal
hydor eth if you have canister for inline
:thm:
 
ended up getting a theo hydor heater 200watt also got another lunar light in blue to add to the one i have and got 1 each for my grandma's and her gentleman friend's tank for christmas
 
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