Reptile & Amphibian Forums

stats: tank-25g, two years old. Lights-5050 coralife 55w 36inch hood, on 11/h a day. prizum skimmer w/limestone. fluval 304 w/2 bags of phosphate free running on high. aquaclear ref, the largest one, one live rock, curly algae. temp 78-80f. 3o pounds live rock. R/O water. no fish. 1 emerald crab, 1 sea erchant(eating everything it touches, very slowly), 10 blue legged crabs, 1 huge red leg crab, numerous turbos, mushrooms, polyps(not many, but do multiply often, exept polyps which are smothered by algae), 1 striped shrimp. use instant ocean salt mix. lights are new. bought new testers(just incase they were reading wronge)-salinity @ 1.023, ammiona 0, nitrate-5.0-10, nitrite-0, alk-240, PH-8.4. just tested.
this algae has been stocking me for over 5 months. I almost gave up after trying everything I was suggested to do. I finnally bought new lights and did a mojor cleaning and harvesting of this hairy, turf algae. and over a period of 4 days did 1/2 water change. the lights i had before were the smae but very old, over 6 months, so i thought the lights alone would cure this problem. but since that day one month ago, the algae has come back looking brighter and fuller then ever! I also have bubble algae, and in some spots under the hairy algae, some cyno. Im wanting to get some jets but im not sure where to put them since my mushrooms dont like the water movement. I usually did a 2.5g water change every week, but i was told that could be causeign the problem so i do it every two weeks now. but still nothing has changed. sometimes my ammonia is @ .25 but then is gone after the water change. I tryed getting a lawnmor blennie and he died withn a week. I have before hand tryed out a tang, and he ate all of it up, but then I gave him away since my tank is too small. so any other suggestions?

also wanted to add, sorry this is so long...my tank is not near a window.