Heater hard to operate

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Skimmy

Aquarium Advice Apprentice
Joined
Feb 19, 2019
Messages
11
Started 10 gallon tank with Topfin heater and I turned knob to create a warmer environment from initial 68 degrees for new tetras. Well, heat went up past 90 and I couldn't get it down. Three Neon tetras died but two manna red tetras survived. Deeply saddened. Poured cold water into tank and turned knob other way. Came down to 90 but not going any lower. Fear remaining two red tetras will died. They are not eating and hiding. They must be afraid. I want to get a digital heater that I can clearly see. Need help.
 
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