Black Film trouble not BBA!
Hey I need some advice! Ive had a severe outbreak of some kind of black algae attacking my plant leaves. Its not brushy like BBA. Its more of a film that coats the leaves and is NOT easily removed. It pretty much destroys the leaf. It started as a small problem but is now getting out of hand. It seems to only attach/grow on the plants. Does not grow on driftwood or rocks/substrate so much from what I can see. It might a little, but it really prefers the plants and covers a good portion of all my plants now. Tank has been running for several months and only suddenly this problem is taking off. Heres a rundown of my equipment.
Tank: 55g "show"
Lighting: just short of 2wpg, with a 4wpg (mid day burst) of about 3 hours, then returning to a 2wpg for the final duration of the light cycle. WAS Total light time of 12 hours. After research realized this was probably way too much. Reduced light cycle to a total of 9 hours as of this week. Same "mid day 4wpg burst" for 3 hours. Bulbs are 2x54w 6700k, and 2x54w 10k
Substrate: Eco complete and flourite sand mix.
Co2: Pressurized running right around 30ppm checked via kh4 solution drop checker.
Ferts: Green leaf aquatics "green pack" dosed using EI method. 55g tank, dosed on monday, wed, friday, with a 50% water change on sundays.
1/2tsp KNo3, 1/8tsp KH2Po4, 1/8tsp K2So4, 1/8tsp csm+b. Only been dosing a week.
Temp: 78 degrees
Plants: Dwarf baby tears, growing and spreading well but starting to be covered in the black film in places. Regular baby tears, was growing intensely, recently being over run by this black film issue. Telantharis cardinalis, growing very well, but older lower leaves being over run by the black plague film. El Nino fern, CRAZY wild growth, but the black film really likes this plants leaves.
Fish: 3 Roselines, 2 GBR, 3 angelicus loaches, 1 striped raphael. 2 SAE's, 2 nerite snails, 3 Amano shrimp.
Im hoping ive started in the right direction by reducing the lighting duration. With the amount of light im running, and ferts and co2, I assume that a now 9 hour light cycle isnt still too much?
If you have any advice on the details ive given you or see anything out of order please let me know! This tank was doing fantastic untill the plants got tall. Now all the lower leaves get attacked by this black crap and just fall off, leaving long bare stems on some with beatiful new growth on the top 1/3rd of the plant.