It has been hot and bright. the blue betta’s tank was afrond with algae and Java moss. I put the fish and his plants aside, then took everything apart and cleaned it, washed the gravel, scrubbed the tank, and so on. I put it back together with half the old water and half new, conditioned water. For the red betta, I cleaned with a siphon and replaced half the water. They both look good. The red betta’s tank was cleaner, perhaps because he has a large snail as a companion to clean up uneaten food.
Here they are all shiny and clean.