I use quilt batting from Walmart for water polishing. It's only a fraction of the price of water polishing filter material from the lfs...I think $6.99 for a king-size quilt portion. Don't use carbon in your filter, take it all out immeditately.
As far as tank inhabitants, you should research what can be humanely kept in a 10 gallon tank...like the betta in your avatar.
As far as tank inhabitants, you should research what can be humanely kept in a 10 gallon tank...like the betta in your avatar.