I need information of safe materials to build a fish guard. I have two clowns in a Biocube 14gal and one has jumped into the cover over the bioballs. He's done it twice today so I grabbed some aluminum foil making into a taller divider. Will this cause any ill effects? Poisoning the water? How long can I use this? Ive seen dividers on eBay but I don't think he will survive another suicide attempt while waiting on shipping. Know one local has it either. What materials can I use to fabricate a permanent one? It is a $90 Picasso 