75g with a fluval filter and zero experience. No freshwater experience either. 75 was a total failure and an excercise in frustration that almost did me in. I'm either brave or stupid (no additional comments required) but I then jumped into a 230g with a 77g fuge/sump that is still up and running but it has since spawned and produced a 190g, a 44g. a 20g, a 24g and a 12g and is soon have another big baby with my 300g cube gets up and running.
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