Support for OHF (Advice needed)

[edwin14]

Hi guys;

I have a 6x2x2 tank with 3 layers OHF.

I had plugged up the OHF holes so that it holds more water.

However after 3 yrs, the silicon for the center bracing gave way and the whole OHF dropped into the tank.

I'm thinking of getting a new tank to replace.

Any suggestions on how I should do up the next tank to support the OHF so that I do not have same issue again.

Advice form bros here will be greatly appreciated.