I bought 50# bag of crushed quartz pool filter sand for about $8 to do a substrate change on a 36 gallon tank. Before room pic. I had lots of buckets to keep fish in and water in to put back in so I would not do a 100% water change.
(Make sure you are good and thirsty!) Second pic showing gravel and background which was too distracting.



(Make sure you are good and thirsty!) Second pic showing gravel and background which was too distracting.






