Heres a question for u all. I was talking to Rod(hubby) and he was wanting to make the tank good enough to hold water and we need to redue the caulking or silacone in the tank. Now heres the question, what chemicles in those should we stay away from. We have some but we dont want to use the wrong kind and hurt our babies. Do you have any suggestions for what kinds to use that wouldnt cost very much. I need enough to redue a 30 gallon tank.