I have a 2.5 gallon shrimp tank that ATM is empty. I had one of those tiny aqueon 10w heaters but it heated my water to 90+ every time. So now I have a giant marina 25w in there that does the job.. Wiu the sponge filter I have hardly any room and it looks very ugly. So, can I bury it under the sand? It's a glass heater.