| a crazy way to make hiding spots for your fish AND at the same time do not loose too much water volume is the following:
get a coca-cola bottle, (size as you wish) and
buy some small-ish rocks, (10-15 mm)
cut the plastic bottle's neck so that it allows the movement of your fish
stick with silicone the small rock the the bottle.
the whole volume of the "cave" will replace just small amounts of your water, YET the smaller fish will feel safe inside.
make sure your cut is JUST about big enough that the small fish get in, but the big ones don't |