I got a 5 Gallon tank with a tetra whisper filter(i couldve gotten a 10G tank for the SAME PRICE AS the 5G but i had no roomD:) anyways, im gonna let it everything run for a day and make sure everythings right before i put my betta in. But one question.. I have a ceramic cup that i made in my ceramics class and i was wondering if this is safe to put in? it has a paint on it, but it was fireburned and i'm very sure it wont chip/flake and the paint makes it very very smooth. and on the parts that are not smooth because there is no paint(intentional) i could sand it out to smoothen it.. Heres a picture. I did actullay put it in for about 2 minutes, and i saw that it was making little air bubbles. Good or bad? please let me know because there's not really any place for him to hide rightnow because i didn't get the rock garden piece.