what kind of filter are u running, if you have a canister you can get an inline heater like hydro 100w 200w n 300w heater that doesnt even go inside your tank. regarding the guard I have no idea.
I thank you all for your attention and time!
75g/Rena Xp3/Inline Heater/Rena Air 200/Eco-Complete/Current Dual Daylight System
6 Rummy Nose, 9 Ottos, 2 Yoyo Loach, 1 Golden Nugget Pleco, 2 Julli's Cory, 4 Angelicus Botia, 1 Chocolate Kuhli Loach, 3 Ghost Shrimp, 1 SAE, 1 Black Mollie, 1 Redeye Swordtail Mollie, 1 C-Pleco, MTS, Guppy's
Argentine Sword, Amazon Sword, Micro Sword, Xmas Moss, Pennywort, Hornwort, Jave Fern, Baby Tears, Moneywort, Ludwigia, Wisteria, Giant Bacoba, Hygro 'Sunset'