Tank had a rinsed coarse sand substrate, 8 well rooted terrestrial plants I n hang on pots, with ceramic biometric, there is a good size tangle of Java fern… same care as my other tanks in this group, as far as feeding and water… but here are 2 Tidal 75’s, and this is only a 45 gallon… fish all look healthy assume it’s some sort of biological bloom… there is also a 10 inch air bar on a good roll… thoughts???