In Hoshi's tank the water has recently become moderately cloudy and pale green in color. My common sense says it's a small algae bloom, even though there are no living plants (everything is plastic), but I figured I'd ask here anyway. To note: recently we had a HUGE bloom of plants outside, so the pollen count has been nuts and everything near my window (tanks included) had a nice coating of fine yellow pollen when I noticed the water get this way. Also, my roommate left the shade up a few days in a row, allowing the dawn sun to shine right into the tank (I usually keep the shade closed). I've done water changes and they help, but then the water keeps getting that cloudy green color again.