Still just plan very very carefully how to seal that tank good and proper if you do it...
Also, i hate to admit it, but i really hope you can prove us wrong, as it seems your dad is still some what in the dark about how much this whole tank will cost to build / run...
Edit:
Also, not to sound rude, but it seems the idea of repect hes hoping to gain from this tank is getting a little to his head preventing him from considering anything other than his 500G tank build... As in won't really consider something like a 250G
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