i made one with terra cotta pot base and a small length of pvc pipe with a cap on the end. works great and cost bugger all. the most expensive thign was the pvc glue but i have now used it about 10 times for many tank things and i would not have even gone through 1/10 of the tin. one tine of pvc glue would do 100 tank related jobs at least and the rest of the materials are as cheap as chips.
i had a large breeding cone that i purchased and the only thing the discus did was swim around it for 2 years! hahhaha
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yeah a peice of pvc pipe siliconed to a small slate slab 4inchx4inch base works great,to easy to make,if your worried it still might get pushed just fill the pvc pipe with marbles/gravel.