@Create New
yours is a special job for sure, we need to brainstorm options before initiating the works. That’s a beautiful tank anyone would be proud to have it, I can see some low-lying growths on the rocks and some light cyano on the sand, it’s a huge tank that’s not easy to run disassembly cleaning for sure. We need to brainstorm other options for your eutrophication repair
notice your sandbed cross section in the areas it’s raised above the bottom edge of the tank, it’s not full of blackened waste, the sandbed is not terribly aged requiring the full rinse we usually do, hope this provides some hope in the matter. It’s a relatively shallow sandbed for sure, relatively clean and the reef isn’t exceptionally high bioload either. Right off the bat: your lighting levels are implicated
those corals you have don’t require this level of brightness and white spectrum the pic shows, this level of power selects for green algae and sandbed growth, your lighting power should be dropped and held for 60 days minimum in assessment, after we custom clean the growths out of the tank. Less whites, less overall power held for two months will not hurt those corals at all. Lighting is driving a lot of your challenge.
fluconazole is a powerful target killer of green algae, it can play a role in assisting us here. There is a six hundred page fluc thread stickied at the top of the nuisance algae forum, notice it’s trend: kill algae, bring on six months of horrible cyano, over and over for years.
we must not do that to your tank / must anticipate the pattern outcomes from that med and shape its use here differently
the masses simply take an algae reef, skip cleaning it, dose fluc which certainly kills green algae, it dies and rots off adding to the current waste loading, and the combined rot + no change in tank stasis brings on massive cyano and dinos wrecks, fluc trades off a gha issue for a matted invader issue when used the common way.
we started right off changing your tank stasis, the lighting as a beginning change away from the prior condition that favors algae and cyano
next up is UV filter. Since the tank is too big to deep clean that effort must be translated into something mechanical and the UV light filter is what you want: that specifically changes tank stasis by burning our cyano and dinos cells and will be crucial in you getting a predictable change in that reef without having to disassembly clean it. Since we are contemplating doing in-tank work, the #1 thing we haven’t done in this thread, we need to anticipate invader cells being cast around the tank even though we are about to clean it in a very customized way. You need to secure the right UV filter for that tank among the options and install it before we begin, it’s crucial and it’s the price to pay for not being able to disassembly clean the system.
UV gives me a 95% positive return on investment in tank repair jobs which is why I’m pressing for it here.
notice your back wall algae: not on the sides but in the middle where light hits strongly and breaks into shimmer
that’s handy, you don’t have a full back or front or sides to scrape, only middle back area.
get a long siphon hose and tape it to the end of a long wooden dowel rod, stick the dowel rod out about an inch past the end of the siphon hose and tape them at the end and in the middle so you have a reinforced siphon hose that is straight and aimable
cut an angled split in the end of the wooden dowel rod, affix in a common razor blade for scraping algae at the correct slight angle
this gives you a firm scraping tool on extension, with a *suction* hose right at the base of the razor taped in place
you would turn off pumps and still the tank, we are trying not to cast algae everywhere as you remove it from that back wall. We aren’t using a med to kill the algae and let it float away, we are truly exporting it because that’s safer and worth the work to prevent tradeoff invasions.
now that the tank is stilled you would begin the siphon and then slowly scrape down and each pass will cleanly remove algae and suction it out vs cast it around the tank. I’ve had people use this method in big tanks and it works well. You’re still needing plenty of new water made for the siphon exchanges but this is far less water than a rip clean requires and your fish can stay, the corals can stay in the tank. Your sandbed isn’t so dirty that this is a risk, that’s a pretty darn clean sandbed you have with some minor top growth.
this will now have your back wall completely clean and exported of algae which is fragmenting around the system currently; it will be gone using export which is the right way in increments to fix that tank
next up post is rocks and sand cleaning and special fluc application to save you from disassembly cleaning. Big post in two parts coming up