Okay so my tanks have not been my absolute priority lately (mostly financially) and it will remain this way for a while so cost is an option for solutions. 90g My 90g with 30g sump which is inhabited by 2 clowns, a mandarin, and a mimic tang, a blasto frag, and a colony of pink lemonade that is trying to come back to life from the electrocution event, as well as a couple snails and crabs. This tank has not had the bulbs changed in a long time but there are new bulbs on order. It gets weekly water changes of 15g, Nitrates = <1. I am sure there are phosphates but they haven't been checked in a few weeks. The tank has terrible cyano right now, and for the past couple months. I blow it all off each week and siphon out what I can. The tank gets fed a few pinches of pellets per day and it has nori in the seaweed clip all day for the tang. The protein skimmer is shot on the tank, it still produces bubbles to oxygenate water but doesn't really pull anything out of the water column anymore. 29g The 29g with 10g sump has been around for 3 years or so and goes through phases GHA on occasion. This tank is inhabited by a yellow clown goby, a couple hermits, a pink chalice, frogspawn, torch, alien eye, duncan, acan, and gsp. It gets a small squirt of nutramar ova daily or every other day. This tank has not had a bulb changed in probably 1.5 years. I am ordering a bulb for it soon. I used to run GFO on this tank most of the time but haven't lately. It gets weekly 5 gallon water changes and manual GHA extraction. Nitrates ~2.5. I am looking for some opinions on what action to take? New skimmer could be an option for the 90g, gfo for the little tank again, new bulbs.