I have an old guinea pig cage which has a plastic base that's is 20cmx120cmx51cm
This is the one I have know my idea was to put a wood frame around the outside of the plastic to give it more support but would this work with dimensions and water volume
That’s a small space for a bichir, but tank mates include peaceful fish not small enough to fit in its mouth. Top water and midwater fish are the best.
A handy calculator for calculating the volume of your fish tank. Use this calculator when working out the holding capacity of your fish tank. If you have other questions, a convenient form will allow you to send questions to an experienced aquarist.