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Black spots on my plants

Joined
4 Jan 2021
Messages
58
Location
Gravesend
I’ve noticed lately that my plants have developed black spots on some of the leaves. I’m guessing it’s algae of some sort. The lights are on for 9 hrs. I’ve recently changed the t8 lights for a nicrew skyled and I have a Superfish retro led. its a 250l tank 60cm deep I dose tnc complete once a weeek. im guessing it’s possibly too much light. What do you think.
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Tad more information needed!
 
sorry I’ll add the extra info.
1: the tank is 250l
2: been set up just over 3 months
3: I’m running a Boyu ef35 and an internal sponge bubble filter
4: I’ve got a Superfish 30w retro LED and a nicrew skyLED which are on for 9 hrs a day.
5: the substrate is Colombo flora base pro with a gravel topper
6: non co2
7: ferts are 25ml of TNC complete once a week
8: 30% water chage every 2 weeks with dechlorinated tap water
9: anubias consensus, Amazon swords, cryptocoryne wendtii, vallis, hygrphilia polysperma, Ludwigia palustrus, rotala orange juice, Christmas moss and fissidens fontanas, all planted between 15/1/21 and 15/3/21.
10: livestock, 4 dwarf gourami, 5 orange fin danios, 2 leopard danios, 5 ottos 1 adult platy and about 10 juvenile, 1 L134 plec and a number of cherry shrimp.
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