how about this custom rear back filter?

[simplelulu]

How about this custom rear back filter? you need to stick them in fish tank by yourself. Maybe you could give me some advice.

 

[reefing102]

Welcome to RC! I’m not sure I’m following the question? It appears it’s designed to make any tank an all in one. The only issue I’m seeing is the bottom intake? (Not sure if that’s what it’s called), could interfere with any sand bed

 

[simplelulu]

Welcome to RC! I’m not sure I’m following the question? It appears it’s designed to make any tank an all in one. The only issue I’m seeing is the bottom intake? (Not sure if that’s what it’s called), could interfere with any sand bed

You are right, it could interfere with sand bed.Maybe the water hole should be raised upwards? But it is no problem just put some small rock in tank without sand.