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Originally Posted by Xaccers
My dad's got himself a huge new fish tank.
It's got a large rock formation made from sponge.
Problem is, when he fills it with water, the sponge just floats.
He's tried squeezing it as much as he can to get the air out but it still floats off from the bottom.
Anyone got experience with this sort of thing and advice?
He's now emptied the tank and removed all the gravel, planning to let it dry out and glue the sponge to the bottom, but there must be a better way, surely?
Help!
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Fish line with non-lead weights? Can you cut the sponge and insert a pebble of something into it to weigh it down?